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Operator
Good day, ladies and gentlemen, and welcome to the Arrow Electronics Second Quarter 2018 Earnings Conference Call hosted by Steven O'Brien. My name is Angela, and I'm your event manager. (Operator Instructions) I'd like to advise all parties that the conference is being recorded for replay purposes.
And I'd now like to hand over to Steven. Please go ahead.
Steven J O'Brien - VP of IR
Thank you, Angela. With us on the call today are Mike Long, Chairman, President and Chief Executive Officer; Chris Stansbury, Senior Vice President and Chief Financial Officer; Andy King, President, Global Components; and Sean Kerins, President, Global Enterprise Computing Solutions.
As a reminder, some of the figures discussed on today's call are non-GAAP. You can access our earnings release at investor.arrow.com, along with the CFO commentary, the non-GAAP earnings reconciliation and the webcast for this call. Please note, prior period figures have been adjusted for the adoption of new accounting standards. We will begin with a few minutes of prepared remarks, which will then be followed by a question-and-answer period.
I'll now hand the call to our Chairman, President and CEO, Mike Long.
Michael J. Long - Chairman, President & CEO
Thanks, Steve, and thanks to all of you for taking the time to join us today. As the only complete life cycle solutions provider, our momentum in the marketplace is stronger than ever. We've been expanding our engineering services to offer more complete solutions. This is actually bringing us closer to our customers and our suppliers, and they're both relying more on us. Our strategy is working, and we're executing well. We achieved second quarter record sales and gross profit, operating income and earnings per share. We said that changes in our industry would result in tremendous opportunities for Arrow, and this is evident in our results.
We produced strong leverage, as operating income and earnings grew meaningfully faster than sales. Our returns improved again. To drive leverage and grow returns, we're working to provide more economic value to our customers and suppliers. To do this, we're staying ahead of the market changes, we're increasing our design and engineering capabilities across the organization. We do business in a way that our customers and suppliers would like us to. This means we're offering a full spectrum of design, engineering, marketing, supply chain services from the lowest touch to the most complex.
One example of a complex engagement is the work we did for a major grocery retailer. We led the design and implementation of that company's digital shelf and video management solution. This solution provides tremendous value to the retailer by increasing automation and worker efficiency, allowing for more merchandising and promotional activity, all while improving the shopping experience, customer loyalty and satisfaction. The retailer is getting valuable business insights by capturing more data and has seen higher in-store sales. For the hardware element of the solution, we provided the prototype development, the testing, the integration, the certification and the production services. For the software elements, we provided the requirement analysis and architecture, application design and development, and testing and integration with store software. We've been integral to this customer's success of the solution from the very beginning.
Returning to results for the quarter, global components continued to take advantage of the broad-based demand stream. Sales were up 18% year-over-year. We're above the high-end of our expectations. We captured double-digit growth in all 3 regions for the fifth quarter in a row. The data we gathered from over 1,000 customers across dozens of industry verticals suggest that this growth will continue.
We continue seeing returns on our investment in engineering and technical sales resources. Design activity grew at nearly 20% this quarter.
Our efforts to get suppliers' products designed end solutions are bearing fruit. This is true for both our existing business and the business that more recently shifted to Arrow. By way of proof, we grew global components operating profit nearly 60% faster than sales.
Global components. Leading indicators remain healthy. Backlog continues to grow at robust rates, but the rate of sequential year-over-year growth moderated. Lead times were largely stable across our portfolio unlike last quarter when we noted some extension. Our book-to-bill was 1.08 for the second quarter, still above parity, but down from the 1.14 in the second quarter of 2017.
Our cancellation rates remained normal. Conditions are favorable and point to a more normal sustained growth for the future. This should allow us to improve working capital efficiency and cash flow from operations.
Many of you have asked about the recently imposed tariffs. Approximately 1% of our sales are impacted, not a significant figure. We're seeing growing awareness and interest by our global components suppliers in our software, cloud and IT hardware solutions. Similarly, we're seeing a growing interest by our enterprise computing solutions suppliers towards leveraging our electronic components expertise and supply chain knowledge.
Our cross-enterprise capabilities are driving our relevance and mind share in key growth industries. For example, 1/3 of our IoT pipeline is from services, and we believe services over time could compromise -- comprise more than 50% of our IoT opportunity. Many of those result in repeatable and reoccurring revenue opportunities.
Another example of our cross-enterprise capabilities come from the hyperconverged industry. Our engineering design and integration business is helping industry leaders in the hyperconverged space, provide intelligent edge computing solution that eliminate resource contingent while automating data and workload mobility. This service is being provided to customers who are looking for end-to-end technology life cycle solutions that reduce complexity and cost while speeding their time to market. Specifically, we work with one hyperconverged provider as an extension of their product, engineering and operations teams to help them design, deliver and support embedded systems globally.
We integrate both the hardware and the software technologies that are best tuned for scale, cost and performance and deliver a complete set of life cycle services.
Global enterprise computing solutions second quarter sales increased 10% year-over-year as adjusted and were in line with our expectation. Like the first quarter, hardware was our biggest growth driver. We see the recent upturn in hardware leading to growth in software demand in the coming quarters.
Looking ahead, we see multiple touch points suggesting enterprise computing solutions can capture even higher profits. The growing adoption of subscription and as-a-service solution have built a meaningful sales backlog that will be recognized in future quarters.
We have leadership positions in securities, hybrid clouds, software-defined architectures. We also have a growing portfolio of reference architectures for things like data analytics, backup and recovery and virtual desktop infrastructure implementations. Suppliers very much appreciate that we get to their products sold using these reference architectures. Customers appreciate that we have proven solutions to help them accomplish their desired business outcomes.
In closing, we had a great first half of 2018. We delivered record results. We expect the momentum to continue. I look forward to updating you on our performance and our progress in the coming quarters.
I'll now hand the call over to Chris to provide more details on our second quarter results and our expectations for the third quarter.
Christopher David Stansbury - Senior VP & CFO
Thanks, Mike. Second quarter sales of $7.39 billion were at the high end of our prior guidance range and increased 15% year-over-year and 13% adjusted for changes in foreign currencies. Acquisitions and divestitures did not meaningfully impact the consolidated sales growth rate.
The actual exchange rate for the quarter was $1.19 to EUR 1 below the $1.23 to EUR 1 rate we previously used for our forecast. This negatively impacted sales by approximately $100 million, and the consolidated sales growth rate by 150 basis points year-over-year.
Second quarter global components sales of $5.28 billion increased 18% year-over-year and increased 16%, adjusted for acquisitions and changes in foreign currencies. Global components sales have been at or above the high end of our expectations for 8 quarters in a row. We had record second quarter sales in all 3 regions.
In Europe, sales increased 21% year-over-year and increased 14% adjusted for changes in foreign currencies. Europe sales have increased year-over-year for 21 straight quarters, adjusted for acquisitions and changes in foreign currencies as we continued to gain share in the marketplace.
Asia again produced exceptional growth this quarter, with sales increasing 21% year-over-year, marking the eighth straight quarter of greater than 15% growth. Asia sales increased 20% year-over-year, adjusted for changes in foreign currencies.
In the Americas, sales increased 14% year-over-year and increased 13% adjusted for acquisitions. Demand continues to be strong across our base of industrial and manufacturing customers.
Global components operating income increased 29% year-over-year and increased significantly faster than our 18% sales growth. As a result, operating margin increased 40 basis points year-over-year to 5% and increased in all 3 regions.
Enterprise computing solutions sales were $2.11 billion, up 8% year-over-year and in line with our prior guidance range. Sales increased 7% year-over-year, adjusted for changes in foreign currencies, the divestiture of the unified communications business in the Americas and both a small acquisition and a small divestiture in Europe.
Billings increased at a high single-digit rate year-over-year, adjusted for changes in foreign currencies.
Growth was driven by the hardware categories of storage and industry-standard servers. Infrastructure software and security continued to grow.
Enterprise computing solutions America sales growth remained strong. Sales in the Americas region increased 11% year-over-year as adjusted and 6% as reported. Europe sales increased 10% year-over-year and increased 1% as adjusted. Our product mix in Europe is more skewed towards software, so the net sales growth tends to be more challenging for the region due to agency accounting.
Enterprise computing solutions operating income was flat year-over-year and increased modestly, adjusted for acquisitions and divestitures. As we stated in the past, we're focused on driving operating profit dollar growth for this business. In the near term, the margin reflects a shift in product mix towards hardware. As already mentioned, we have opportunities to drive better profit growth in the coming quarters.
Returning to consolidated results for the quarter, total company operating expenses increased 10% year-over-year and increased 8% year-over-year adjusted for changes in foreign currencies. Operating expenses decreased 40 basis points as a percent of sales on a year-over-year basis.
Interest expense was $61 million due to some additions -- or, sorry, some actions we chose to pursue during the quarter. The working capital needed to support our rapid organic growth has caused significantly higher average borrowings and, therefore, higher interest expense. In addition, during the second quarter, we booked interest expense arising from the end of interest capitalization on our Americas components ERP implementation that successfully went live during the first quarter. We expect interest expense in the low to mid-$50 million for quarter range for the balance of 2018.
The effective tax rate for the second quarter was 23.5%. Our effective tax rate was towards the lower end of our 23.5% to 25.5% target range. Recall, the first quarter effective tax rate was towards the higher end of our target range. As we mentioned last quarter and throughout last year, we expect somewhat more variance quarter-to-quarter in our tax rate due to the timing of discrete items.
Net income was $195 million, up 23% year-over-year. Earnings per share were $2.20 on a diluted basis, at the high end of our prior guidance range of $2.08 to $2.20.
Earnings per share increased 24% year-over-year. We estimate the strengthening of the dollar negatively impacted earnings per share by approximately $0.08 and negatively impacted earnings per share growth by approximately 5 percentage points compared to the rates we used when we issued second quarter guidance.
Operating cash flow was negative $410 million, driven by the need for working capital additions to service our record growth levels. In addition, more than $200 million of the decline was related to mismatched timing of receivables and inventory positions related to a new customer engagement that reversed within the first few days in the third quarter and will be entirely captured by third quarter cash flow.
Return on invested capital increased 100 basis points year-over-year, the third quarter in a row of 100 basis point increases. We're capturing higher returns on our organic investments in the business.
We repurchased approximately $20 million of our stock, approximately $110 million over the last 12 months and approximately $1.1 billion over the last 5 years. Entering the third quarter, authorization remaining under our share repurchase program is approximately $299 million.
This is a high-level summary of our financial results. For more detail regarding the business segment results, please refer to the CFO commentary published this morning.
Now turning to guidance. We believe that total third quarter sales will be between $7.15 billion and $7.55 billion, with global component sales between $5.25 billion and $5.45 billion and global enterprise computing solutions sales between $1.9 billion and $2.1 billion. At the midpoint of guidance, enterprise computing solutions sales would be up 3% year-over-year, adjusted for the unified communications divestiture.
In the third quarter, we expect a richer mix of software compared to the first and second quarters. This dampens net sales growth due to the agency accounting treatment. Included in our guidance is $7 million of expense, or approximately $0.05 per share, that we will recognize during the third quarter to settle a sales tax issue in one of the international entities within the enterprise computing solutions business. We will include this expense in our adjusted third quarter results, and we expect this issue to be fully concluded in the third quarter.
We expect interest expense to be approximately $53 million in the third quarter and, as a result, we expect earnings per share on a diluted basis, excluding any charges, to be in the range of $2.09 to $2.21. Our guidance assumes an average non-GAAP tax rate of 23.5% to 25.5%. We expect average diluted shares outstanding of $89 million. And the average U.S. dollar to euro exchange rate we are using for forecasting purposes is $1.17 to EUR 1, which is the average rate through the month of July.
Steven J O'Brien - VP of IR
Thank you, Chris. Angela, would you please open up the call to questions at this time?
Operator
(Operator Instructions) We have our first question which comes from Shawn Harrison from Longbow Research.
Shawn Matthew Harrison - Senior Research Analyst
The first question I have is just the improved EBIT leverage in the components business we've seen in the first of the year. Does that stay at the same pace in the back half? Or could it accelerate as you see more demand creation business and growth in the digital platform?
Michael J. Long - Chairman, President & CEO
Pretty much as we said, one of the reasons you did see the acceleration was that 20% increase in demand creation. So as the mix continues to be favorable, you would continue to see that. And if you remember, we said we had a long ways to go to be able to catch up with the additional fee for -- or the additional supply chain business that we had coming in. We still believe that. We don't believe we're at the top of that, and as long as we can continue to execute on -- in the engineering piece of the business, I think it'll continue to go.
Shawn Matthew Harrison - Senior Research Analyst
And then as a follow-up. Chris, you've converted, I guess, $200 million of the cash flow usage in the June quarter. Would you expect to be generating positive cash flow from operations in the back half of the year? Are there still challenges in terms of working capital management that you have to work through?
Christopher David Stansbury - Senior VP & CFO
Yes, Shawn. So obviously, it depends on where the growth rate is. But as we've talked about in the past, when we get to 10% or below, that's where you would expect to start to see positive cash flow from operations. I think in the near term, it'll plateau for a quarter and, at that point, it should start to turn positive. So I would expect by the end of the year, at current growth rates as we've guided, you would expect to see some level of positive, yes.
Operator
Next question comes from Joe Quatrochi from Wells Fargo.
Joseph Michael Quatrochi - Associate Analyst
I had a question on the components side. I know a lot of companies have been kind of referencing this shortage of MLCCs. So I was kind of curious what's your exposure there? And then how do you think about the availability of those components negatively impacting the demand for other components?
Michael J. Long - Chairman, President & CEO
Andy, would you like to take that?
Andrew D. King - President of Arrow Global Components
Yes. You're quite right, Joe. We still have a constrained supply situation on MLCC. There is more product actually coming through and out to the marketplace, but the demand is outstripping that. So we're continuing to manage our supply chains with our supplier partners very, very carefully. At this point, we are -- more things are getting built, more things are getting to market. So we're sort of keeping pace with the demand. But it's a process that we keep very close tabs on and work very carefully with our customers and suppliers.
Joseph Michael Quatrochi - Associate Analyst
Okay. A follow-up for Chris. I just wanted to kind of go through the puts and takes of gross margin for this quarter and kind of -- I know you don't guide, but what's kind of embedded in the guidance for the September quarter?
Christopher David Stansbury - Senior VP & CFO
So really, one of the things that we talked heavily about last year is as we transition new business in, it would come in at fulfillment margins, but then we could start to work on the demand creation behind that in addition to the higher-margin activities around digital, for example. So we would expect that gross margin would continue to improve as we move into the back half of the year as a result.
Operator
Next question comes from Matt Sheerin from Stifel.
Matthew John Sheerin - MD & Senior Equity Research Analyst
Just following up on Joe's question regarding not just the MLC situation, but as you've pointed out in recent quarters, there have been extended lead times on a number of components. And if you look at, basically, every part of the supply chain, whether it be the EMS guys, OEM, distributors like yourself, inventories are at elevated levels and multiyear highs on a days basis. So it seems like, Mike, you're seeing things start to stabilize here. And as that happens, do you expect customers to adjust their working capital and the inventory down commensurate with the lead times coming in? And would that lead to any sort of ripple effect correction in the supply chain?
Michael J. Long - Chairman, President & CEO
Matt, thanks. What we're seeing right now, and I think I sort of indicated that in my prepared comments is a softer landing. And what I expect to see that's different from others is sort of a continued growth, but at a slower pace. Remember one of the things that we did different this time, which I was very clear with you guys in the beginning, was that we were going to place orders on the suppliers out well in advance to make sure we had a good balance of inventory. Obviously, that used a little bit more of our cash, but it allowed us to satisfy our customer base with a wider range of products, and that has been a good thing. As the growth moderates, it looks like the inventory levels will come down while the growth continues to be there and that we're not expecting big changes by customers because we do monitor sort of the double ordering process, and we don't have it. When we see it, we get with the customer and try to figure out exactly what their needs are, which has allowed us to be very specific with the manufacturers. And they also have this sort of double ordering catchall in their businesses too. So things are much cleaner this time. I expect a softer landing. I expect things to continue. We're seeing strong design activity, which also tells us that the market is still chugging along and new products are still getting developed. That's one of the first things that starts to go when you see a pullback. So I'm not expecting a pullback, Matt, just expecting a little slower growth.
Matthew John Sheerin - MD & Senior Equity Research Analyst
Okay, fair enough. That's helpful. And then as a follow-up, just sort of playing into that fairly favorable environment from a seller's standpoint. Your margins were up nicely in components and you talked about the demand creation business driving some of that, but did you get any favorable pricing or any sort of margin lift from the strong environment and the demand environment?
Michael J. Long - Chairman, President & CEO
We didn't raise the prices on our customers. We -- I think as I told you going into this, we had supply chain orders from customers. We were bringing business over. So we did not sort of take that and up it if a customer was in trouble. We've lived up to the commitments we made to the customers prior to the increase in sales, and I think that has paid off. As a benefit, the entire increase in margin that you're seeing is based upon the mix change of design activity and design product versus fulfillment products. And so we do expect that to continue for us because, obviously, when we design something, we have a little more cost into it than we do when we don't. And I don't expect a downturn in the margin when the market softens.
Operator
Next question comes from Adam Tindle from Raymond James.
Adam Tyler Tindle - Research Analyst
Chris, I just wanted to start on cash flow, but should probably first acknowledge your growing profit dollars north of 20% while improving ROIC, which is probably more important now. But it does sound like there's a number of cyclical items that are suppressing cash flow. So wanted to ask if there's anything more structural that would keep cash generation more muted than previously where you were converting north of 100% of net income for a number of years. And is it reasonable to assume that when cash flow reverses and becomes positive that this will materially increase the buyback level?
Christopher David Stansbury - Senior VP & CFO
Yes, Adam. First of all, thanks for the kind comments. But our feeling on this is that when things do return to more normalized growth rates, we should be delivering about 100% GAAP net income in terms of cash flow from operations. That's the way we think about it. So I don't expect that there's anything structural that's changed. It's really all about the growth rate now and absorbing that to your point. What we'll do with that, we will continue to buy back stock when we believe we're well below intrinsic value, and at today's valuations, that's exactly where we think we are. We think there's a lot of room for us to do buybacks. We've got a lot under authorization from the board, and the board is very receptive to expanding that if it continues to stay suppressed. As we've also mentioned in the past, we will bring down debt a little bit, but buybacks are a key part of what we'll do with that cash.
Adam Tyler Tindle - Research Analyst
Okay. Very clear and helpful. And Mike, I know you mentioned we should see some improvements here, but operating profit dollar growth in the computing business has been minimal for 7 quarters or so now. I just wanted to ask how do you think about the portfolio in that business strategically. Are there areas that you could either add or maybe even subtract or divest to improve that trend?
Michael J. Long - Chairman, President & CEO
Yes. Actually, let's remember what we have been going through there. We went through a change of rotating disk to solid state. We went through a no-growth scenario on servers and, at the same time, we were building our software practice. If you look at the -- where that business is today, all of those issues have reversed themselves to right now. So I expect this business to continue to improve going forward. And so there is nothing different than what we've exposed in the past. The bookings are good. The backlog is good. The business is looking pretty sustainable. Just a note and it's, obviously, something we don't really talk about that much, but if you take the -- just the conversion rates in Europe, I think Europe is about something like 11%, currency adjusted. So we are seeing the growth. Now it's a matter of getting that to the bottom line, and we think the growth will take care of that. That's why I made those comments in the sort of opening session that I believe that, that business is going to improve.
Operator
Next question comes from Steven Fox from Cross Research.
Steven Bryant Fox - MD
I know you mentioned the new tariffs that are in place globally are sort of a 1% impact to your sales. But what -- can you talk a little bit about the indirect impact that you may see in the supply chain? My understanding is a lot of your suppliers are raising prices into the channel. Can you talk about what impact that might be? And I have a couple of follow-ups.
Michael J. Long - Chairman, President & CEO
Yes, Steve, just a few things. So there's a number of suppliers that are taking care of the tax themselves, there is a few suppliers that are not. So where they don't, we'll pass that on. It's not our job to make suppliers that don't want to pick up their sales tax to make them more competitive for the ones that do. So that will sort of keep that balanced. There are moves by some suppliers and by us to reroute supply chains to make it even more favorable, and that's why I say the impact right now is minimal based off of the information we have. I can't speculate on where it's going. I'm not overly concerned today. And as I said, it's minimal to us, and I think just with some of the supply chain stuff we're talking about, it could even be less than that.
Steven Bryant Fox - MD
Okay. That's very helpful. And then secondly, Mike, you threw out a lot of the services that are sort of gaining traction quarter-over-quarter or as you look back over the last 12 months. If you had to sort of highlight some of the biggest drivers in terms of your expanded capabilities right now, what would you call out and how do you see that changing over the next couple of quarters?
Michael J. Long - Chairman, President & CEO
Sean, since you've been driving that, I'll put that one to you.
Sean J. Kerins - President of Global Enterprise Computing Solutions Business
Yes, sure. No, absolutely, Steve. We're doing more and more from a cross enterprise perspective. So as Mike pointed out in the opening script, Andy and I now partner much more closely with our major components suppliers and with our major IT suppliers. So we find ways to kind of diversify those relationships. Where we once talked to an IT supplier strictly about go-to-market, now we talk about things like design, engineering and production of the actual systems that we help them sell. And where we once talked strictly about go-to-market in a 2-tier fashion, we now introduce our supply chain people to their supply chain people and we find that there's things that they choose not to do themselves and they can rely on us in a much more efficient fashion. If you look at it in reverse, we have a kind of growing pipeline related to what I would call the intelligent edge or sort of a big use case around IoT where my sales team will partner with Andy's sales team to try to capture the down team benefit that emerges from an IoT use case, and that just opens up a whole lot more opportunity and a whole lot more DTAM for us go after. So we feel good about the progress we're making to collaborate across the enterprise, and I think it will continue to pay dividends over time.
Steven Bryant Fox - MD
I appreciate that color. And lastly, Chris, the $200 million of sort of working capital drag in the quarter, you said it was related to one customer. Is it a special type of engagement? Or why was that number so large. Is there any other color you can provide on that? And that one is the last one for me.
Christopher David Stansbury - Senior VP & CFO
Yes. No, it really relates to the services offering that we talked about, an expanded services offering. It's in that category. I want to keep it kind of at that level. We do think that going forward, it should be relatively working capital neutral. So I don't expect this would be recurring.
Michael J. Long - Chairman, President & CEO
Steve, I might add to that. A lot of the services we're now offering have become attractive to some of the bigger customers that exist out there today. And we fully expect to have some more engagements around some of these bigger customers, and it would not be uncommon to see it. Obviously, this engagement being the first one of this type, it started late in the quarter. We got the program set up. It cost us some money. We were able to collect the money within a period of time, but most of these deals are working capital neutral for us, so I wanted to highlight that, that I don't really expect in future quarters we're going to be seeing a lot of one-timers like this. And it really was just when we got the things set up that caused that.
Operator
Next question comes from Param Singh from Merrill Lynch.
Paramveer Singh - Associate
Firstly, I wanted to go back to the component side. There are other private distributors and channels that have commented that given the strength of the backlog that book-to-bill might actually trend down again towards parity or possibly below parity, but that might belie underlying strength. What are your thoughts on that given that you've come from 1.2 to 1.08 this quarter? And how has the backlog strength changed -- or do you have any cause for concern given the down trend in year-over-year strength in your backlog?
Michael J. Long - Chairman, President & CEO
No. And remember, we really started building our inventories and increasing our sales during the upcoming quarter. So it's a harder lap for us in the first place. The second place is we're still seeing very good growth at 1.08. That tells us that the economy is even better than what we thought it was then. I don't expect that parity thing to go on for a while. We've seen increase in customer backlog. We've seen the increase in bookings. We've seen higher demand generation opportunities, and our sales growth plans continue like we saw before. So I can't tell you what's happening to others. I can only tell you what our growth rates look like and, I guess, you just have to look at the growth rates compared to others and see what's happened over the last 5 quarters, but we're in good shape.
Paramveer Singh - Associate
So in that vein, do you think at some point over the next few quarters book-to-bill could reach parity again, not because there's an issue with strength, but because now that you have such a strong backlog that customers might pause briefly on order patterns? Do you have any view on that?
Michael J. Long - Chairman, President & CEO
Well, look, even if it does, that would be a positive because it wouldn't go negative. And really, if it did go to parity, that would really indicate a soft landing and we would get there much faster because you would bleed off the inventories you had and the current shipments you had, and they would continue on. You would just be probably bringing in your future order pattern a little bit until you got to that parity. So it's not a negative. That, in fact, for me right now would be a positive because we'd start throwing off some pretty good cash at that level because we've grown the company to a big size, which means a lot more cash than we've ever thrown off in history. So it isn't bad.
Paramveer Singh - Associate
Got it. And as my follow-up, switching to the ECS side, how much impact to your margin in ECS this quarter was due to higher hardware mix versus any FX impact? And similarly for next quarter, what can you delineate the different impact between higher software mix and FX and that $7 million cost that you mentioned that's impacting your revenue and margins?
Michael J. Long - Chairman, President & CEO
Yes. So what I'll do here is I'll let Sean go through the individual products with you because there was a mix change, and then I'll have Chris talk about the tax issue.
Sean J. Kerins - President of Global Enterprise Computing Solutions Business
Yes. So if you look at the business mix year-over-year, you're kind of looking at an apple and an orange. We've got to our sales guidance in Q2, but a little bit differently than we thought. We had better hardware and a little bit less software. So that certainly contributed to some of the margin pressure. But one of the factors surrounding the lighter software than we expected in the quarter is that we are seeing a more meaningful growth in our what I would call unbilled or as-a-service software solution revenue, which will bill out in the future periods, as Chris mentioned. We, ultimately, think that's a good thing because recurring relationships tend to be very sticky, and it will help to build a bigger pipeline for us in the future. But as we look to Q3, you're kind of seeing a reverse of that. We see a return to a more normal, in fact, overweighted mix of software versus hardware, which creates a little bit of a different year-over-year compare. And certainly, things like the size of our public sector business will contribute to that. This is the federal government buying season, and we expect a strong top line quarter from our mix business, and that's one that's decidedly pointed to software and services.
Paramveer Singh - Associate
And then was there any FX impact on your guide? Or maybe what's the underlying billings growth assumption in your ECS guide?
Christopher David Stansbury - Senior VP & CFO
Yes. We don't, obviously, provide guidance around the billings. I would tell you that the FX is relatively flat quarter-on-quarter, $1.18 in Q2 and $1.17 in Q3.
Operator
Next question comes from Adrienne Colby from Deutsche Bank.
Adrienne Eleanor Colby - Associate Analyst
Most of my questions have been asked already, but going back to the operating margins on the components side of the business, I'm just wanting to understand a little bit better, with the stronger mix of Asian and European sales, which are typically lower margin, if you could just talk about again how you got to that 5% target margin. And just wondering too, how geographically diverse your design activity is.
Michael J. Long - Chairman, President & CEO
Well, first off, let me thank you for noticing the 5%. I was sort of sitting here waiting and going is anybody going to even acknowledge, which sort of goes back to my question, I think, a year ago, is do we get some sort of prize if we get there, and obviously, I've learned today, the answer is no. But it's -- basically, all of our businesses have become more efficient. We are doing much more design work in Asia, which has helped us raise the profits for us in Asia. We've seen the same in Europe, we've seen the same in North America, and all those businesses have combined to have really driven us to that number, and it's largely been because of the change of mix of design services. We aren't sure or, I guess, not sure, but I'm not ready to commit to any other number for you around that because, I think, we need to make sure we know exactly how the business is reacting to all of this. There was no heroics in there. There was nothing special we did to get to it. It was the same plan that we had indicated to you all along. So I don't expect it to change. I expect it to continue. And in future quarters, we'll get more specific about it. But I'm also going -- if I said 6% and there'd be no prize when we finally got to 6%, there'd only be beatings along the way. So I'm kind of comfortable with where we are.
Adrienne Eleanor Colby - Associate Analyst
As a quick follow-up then, so there's no benefit from the ERP system rollout that you completed last quarter, for example, or an expectation that, that's going to give a lift...
Michael J. Long - Chairman, President & CEO
Yes, yes. What happens with the ERP system, which I think you're going to see in future quarters is that makes us more efficient. That gives us better productivity. That means we can do more. That also means that we can invest more in engineers to even grow our profits higher. So there's a lot of changes in our business that we can either reroute the money or take it to the bottom line, but there is no big investment right now of anything that we need to do or put in there that are going to drain from that efficiency. It's all going to be put towards the go-to-market side.
Operator
Next question comes from William Stein from SunTrust.
William Stein - MD
I promise I was going to congratulate you on hitting 5% margin. If only you called on me first, you would have heard it earlier, but I think from now -- the beatings will cease from now. But I do want to ask something about that segment, in particular supplier additions that you've had over the last couple of years owing to some dislocations at your -- at one of your bigger competitors. Can you update us on any additional changes from a supplier perspective? I think there was an announcement from one of them just this past week that they're going to be sort of reauthorizing the one that they cut out earlier. Any additional gains? And how you expect that change that I just mentioned to influence the model going forward?
Michael J. Long - Chairman, President & CEO
Yes. I think much like you've seen in the past, acquisitions sometimes change things. I don't expect it to be a big deal. The supplier you referenced was not exclusive with us in the first place. So that's another piece of this and where they will ultimately go, it will be their decision. We don't see any change in the performance we have going forward. We certainly, to be honest with you, would love it as our competitor gets stronger because that's just going to validate the entire supply chain, so what we've been telling you all along. Again, I don't see any change for us. I don't think you're going to see any massive changes on a go-forward basis. The business is what it is right now, and we're performing well, our engineers are performing well. And we expect things to stay pretty much like they are.
Operator
Next question comes from Mark Delaney, Goldman Sachs.
Mark Trevor Delaney - Equity Analyst
Actually, I have another one on the global components EBIT margin. Also nice to see you come in at that 5% level. I know you've worked hard as an organization to get there.
Michael J. Long - Chairman, President & CEO
Everyone is going to say that.
Mark Trevor Delaney - Equity Analyst
A typical seasonality in the third quarter for components EBIT margin is usually flatter or maybe down slightly just as some of the regional mix shift changes. There's some tailwinds though coming in with this increased design work. So I'm just trying to get the sense for how you're thinking about the margin in that segment for the third quarter. Is there maybe just some seasonality? Or is enough of these tailwinds coming in that you can stay at that 5% level?
Michael J. Long - Chairman, President & CEO
Yes. Actually, we're expecting to. I think the guidance sort of suggests a flat to up for us going into the third quarter. And the growth rates continue, the design win activity continues. So you're absolutely correct, if you go back couple of years, it was pretty much third quarter was always down like 1% or something like that, pretty close to parity gets down. We're now kind of seeing parity be up, and we're expecting the same thing.
Mark Trevor Delaney - Equity Analyst
Got it. That's helpful. And follow-up on the tariff topic. I appreciate all the comments that the company had. That was helpful to understand. But just trying to better understand some of these indirect potential impacts. When you talk to your customers, given the potential for the tariff situation to escalate and some of these potential extra costs, do you think any customers have pulled forward demand to try and get ahead of any of these potential tariffs that may occur?
Michael J. Long - Chairman, President & CEO
Yes. We're not seeing any customers pulling any demand ahead. In fact, I think most customers are looking at this thing. It's just -- it's pretty ludicrous to start playing this game, which it is just a game, and I think we should all figure that out. I think it's a matter of quarters for this thing to get solved. None of us like tariffs. None of these businesses like tariffs. These tariffs that are coming in and I'll tell you the same thing I told the Senator is all they do is they hurt America businessmen, they're not doing anything to the Chinese right now. So that's the only message I want to get across. I think they're crazy. And we'll do what we have to do. But as I said right now, I'll go back -- these tariffs are not material to the electronics industry at this point. I think, virtually, every supplier that came out said the same thing I do. They are less than 1%. Some of them are going to absorb it. There's a couple of them that aren't going to absorb it. But that -- so if you're a customer, you're sitting there looking at less than 1% of your purchases are going to do it. In an upturn, you have that kind of a problem to deal with anyway. So I don't see it with us. I mean, I guess, if you're bending steel or aluminum or something like that, you might see it, and how that ripples through the supply chain, I don't know. But right now we're not seeing a slowness in demand. We're not seeing an increase of people bringing their business in. And frankly, manufacturers are all over the world today. So they have plants all over the world. And if they want to start something up, we can redirect supply chain completely out of the U.S. in a moment's notice and totally eliminate the tariff. So I'm not worried.
Operator
Next question comes from Jim Suva from Citi.
Jim Suva - Director
And again, congratulations on the 5% margins as well as just overall good results.
Michael J. Long - Chairman, President & CEO
Jim, coming from you, that's like the best comment of the day.
Jim Suva - Director
I am very sincere with that.
Michael J. Long - Chairman, President & CEO
I know. I appreciate it.
Jim Suva - Director
I have a strategy question for Mike and then more of a financial question for Chris. Mike, your business has grown geographically very strong in all the different regions and breadth of it was very broad-based this quarter and has been consistently across all the various regions. Is there ever a need to go into Asia with the computing segment? Or is it just most of North America, Europe focused. The reason why I ask is your components have been very strong in Asia also. So I just didn't know if there reaches a time in point where you need to have a footprint there or not or it's just completely different business conditions. And then, Chris, on the finance side, you made a comment about, I think, it was $0.05 impact to sales tax or something like that. I assume that's a onetime cumulative rolled up of multiple quarters of that item and then we don't see it going forward or maybe you can correct me if I'm wrong on that $0.05 impact.
Michael J. Long - Chairman, President & CEO
Jim, I'll start with Asia piece. First off, we don't see the need just because Asia component is doing well to migrate ECS to Asia. We do have ECS in a few places in Asia. But basically, what we are doing is bringing together the IoT pieces of the ECS business to Asia so they can enjoy the same type of opportunistic benefit from that, that our components business in the other 2 regions is doing. What we did say about ECS expansion into Asia was that when we saw conditions being favorable. And the software conditions in Asia are not really favorable for anybody to expand there. The hardware conditions are not that favorable either. So we just don't see the business model working to the success of our investors at the rate that makes it worth it to make that kind of expansion. We continually monitor it as we see it over time, and we do see benefits will certainly be there. But I'm not into investing a lot of money into something that I don't see a return, never have been. And what I do see is a return on the IoT pieces. So our cloud work and some of our specific software-defined work and some of the hyperconverged work and the edge work, yes, we do see moving that as an expansion of the components product line card. And hopefully, that answers your question.
Jim Suva - Director
Indeed, it does.
Christopher David Stansbury - Senior VP & CFO
Yes. And then, Jim, just on that sales tax thing, yes, it's a onetime issue that we are resolving. It will be contained in the third quarter. To put it in perspective, the midpoint of our guidance is $2.15, including that issue. So the other way of looking at it is excluding that issue, the underlying business is really at midpoint at $2.20.
Jim Suva - Director
Okay. And Chris, as a follow-up, that doesn't impact your like future corporate tax rate or anything. It's just kind of a resolution and then move forward. Am I correct?
Christopher David Stansbury - Senior VP & CFO
Correct. It's a dispute over a sales tax issue in one of our acquired entities, and we're resolving that.
Operator
Next question comes from Lou Miscioscia from (inaudible).
Louis Rocco Miscioscia - Former Senior Analyst of Information Technology Services
I'm not sure if I'm last or not, but might be what have you done for me lately and back to business if we don't end the call. So good luck for that. So on the ECS side, you mentioned subscriptions, maybe just a little bit of detail what specifically that is. And how are you going about it? And at what level is it possibly a bit material since you mentioned it?
Michael J. Long - Chairman, President & CEO
First off, we -- as you know, we normally don't mention anything here until we at least have a little bit of a track record around it. So I think it's probably okay for Sean to give you a little more color on that.
Sean J. Kerins - President of Global Enterprise Computing Solutions Business
Yes, absolutely. I think we've seen it accelerate. If I look at the levels of that number year-on-year, we've seen it accelerate meaningfully. So we're paying closer attention to it. And part of it is related to pure cloud growth. I think part of it comes from the fact that customers are looking to take advantage of the benefits of consumption-based IT for software licensing, for example, without necessarily going to the cloud. Part of it reflects suppliers looking to build recurring revenue portfolios. So we noted it because it did have a modest sales impact to our Q2 results. But ultimately, it's still with us and we'll recognize it in future periods. So again, I feel good about it because it's sort of an extension of our solution selling motion, and we expect it to grow further over time.
Louis Rocco Miscioscia - Former Senior Analyst of Information Technology Services
Okay. And then sticking with this area, I guess, you mentioned storage and servers, obviously, are hanging in. They're doing very well with the drivers probably flash and also Intel's upgrade cycle. And any -- as we are heading to doldrums of summer, any view as to how either September or the back half (technical difficulty) finishes up just from, in general, not necessarily your particular guidance?
Michael J. Long - Chairman, President & CEO
Yes. I think what we said was more software. You have our guidance in the business. We're expecting things for us to improve and improve year-over-year. Right now we're not seeing anything that diminishes the fourth quarter, although, that -- as we said before, we don't go out that far. But we're not -- frankly, we're not expecting any bad news in the business from a change of circumstance, product line, go-to-market, clouds going to tear us apart too, Amazon is going to kill us. I think we're pretty stable going forward here.
Operator
I'd now like to hand back to Steven O'Brien for closing remarks.
Steven J O'Brien - VP of IR
Thank you, Angela. In closing, I will review Arrow's safe harbor statement. Some of the comments made on today's call may include forward-looking statements, including statements addressing future financial results. These statements are subject to a number of risks and uncertainties that could cause actual results or facts to differ materially from such statements for a variety of reasons, and the company undertakes no obligation to update publicly or revise any of the forward-looking statements. Detailed information about these risks is included in Arrow's SEC filings. If you have any questions about the information presented today, please feel free to contact me. Thank you for your interest in Arrow Electronics, and have a nice day.
Operator
Thank you. Ladies and gentlemen, that concludes your call for today. You may now disconnect. Thank you for joining. Have a good day.