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Operator
Good day, ladies and gentlemen, and welcome to the first-quarter 2015 OSI Systems earnings conference call. My name is Glenn and I will be your event manager for today. (Operator Instructions) As a reminder, this conference is being recorded for replay purposes.
I would now like to turn the conference over to your host for today, Mr. Alan Edrick, Chief Financial Officer.
Alan Edrick - EVP & CFO
Good morning and thank you for joining us. I am Alan Edrick, Executive Vice President and CFO of OSI Systems, and I'm here today with Deepak Chopra, our President and CEO.
Welcome to the OSI Systems first-quarter fiscal 2015 conference call. We would like to extend a special welcome to anyone who is a first-time participant on our conference calls. Please note that this presentation is being webcast and is expected to remain on our website located at www.OSI-systems.com for approximately two weeks.
Earlier today we issued a press release announcing our first-quarter fiscal year 2015 financial results. Before we discuss our financial and our operational highlights I would like to read the following statement.
In connection with this conference call the Company wishes to take advantage of the Safe Harbor provisions of the Private Securities Litigation Reform Act of 1995 with respect to statements during this call that may be deemed to be forward-looking statement under the Act. Forward looking statement relate to the Company's current expectations, beliefs, projections and similar expressions and are not guarantees of future performance or outcomes.
Forward-looking statements involve uncertainties, risks, assumptions, and contingencies, many of which are outside the Company's control, that may cause actual results or outcomes to differ materially from those described in or implied by any forward-looking statement. Such statements include, without limitation, information provided regarding expected revenues and earnings in fiscal 2015 and statements regarding the expected overall financial and operational performance of the Company and its operating divisions.
The Company wishes to caution participants on this call that numerous factors could cause actual results to differ materially from these forward-looking statements. These factors include the risk factors set forth in the Company's last annual report on Form 10-K and other risks described in documents subsequently filed by the Company with the SEC from time to time. All forward-looking statement made on this call are based on currently available information and speak only as of the date of this call and the Company undertakes no obligation to update any forward-looking statement that becomes untrue because of new information, subsequent events, or otherwise.
During today's call we may refer to both GAAP and to non-GAAP financial measures of the Company's operating and financial results. For information regarding non-GAAP financial measures and comparable GAAP measures and a quantitative reconciliation of those figures, please refer to today's press release regarding our first-quarter results, which has also been furnished to the SEC as an exhibit to a current report on Form 8-K.
Before turning the call over to Deepak to discuss the business in more detail, I will provide a high-level overview of our financial performance. We will again touch on several themes that we have discussed during past conference calls. Let's begin.
Highlights for our first quarter of fiscal 2015 are as follows. First, we reported record first-quarter revenues of $218 million, a 6% year-over-year increase. The growth was driven by another solid quarter in our security division, which grew 17% as a result of strong equipment sales including partial fulfillment of the foreign military sale contract to the US Department of Defense.
Second, we reported record Q1 non-GAAP diluted earnings per share, excluding restructuring and other charges, of $0.57, which are presents 24% year-over-year growth. This marks the 20th quarter out of the last 21 that we achieved double-digit non-GAAP EPS growth.
Third, we generated record Q1 free cash flow of $28 million and concluded the quarter with a strong balance sheet. Finally, yesterday we announced the successful resolution of the open matter with the Department of Homeland Security stemming from the TSA issues reported on last year.
Before jumping into additional financial details, let me turn the call over to Deepak.
Deepak Chopra - Chairman & CEO
Thank you, Alan, and again good morning and welcome to the OSI Systems earnings conference call for the first quarter of fiscal 2015.
As Alan mentioned, we had a good start to fiscal 2015 in the first quarter, led by continued strong growth in our security division. The results have placed us in a good position to build upon this momentum for the remainder of the year.
Let us review the highlights for the quarter, starting with our security division, Rapiscan Systems, where revenues increased 17% to $113 million. There were several accomplishments in the quarter that I would like to discuss.
During the quarter we continued to successfully deliver on the foreign military sales contract from the Department of Defense to supply multiple units of cargo and vehicle inspection systems and related training, spare parts, service, and logistics support to Iraq. In addition to the FMS contract, our overall equipment sales were robust as we experienced increased activity from several regions of the world. As an example, during the quarter our security inspection systems were utilized at the 2014 Glasgow Commonwealth games.
In Turnkey services, current programs continued to strongly contribute to Rapiscan's overall performance and we continue to pursue a number of new opportunities for additional turnkey security solutions. We are optimistic about new turnkey customers coming aboard in the future.
Our advanced CT hold baggage solution, the RTT, continues to be evaluated by the TSA for the inspection of checked baggage at airports and we are hopeful to receive certification by fiscal year-end, but there is no guarantee. As you may know, RTT has already passed the European Civil Aviation Conference, ECAC, Standard 3 threat detection test for standard and large tunnel size configurations. We have a growing pipeline of potential RTT customers and expect new bookings over the course of this fiscal year.
We are currently bidding on various tenders for RTT internationally. As major airports around the world revitalize their screening infrastructure, our products with the latest technology for both checkpoint and checked baggage inspection solutions, are often leading candidates.
Finally, as Alan mentioned, we announced yesterday that we reached agreement with the Department of Homeland Security and entered into an addendum to our existing administrative agreement. The addendum is a result of a DHS review of issues uncovered and self-reported by Rapiscan last year and has the effect of extending the administrative agreement. US federal agencies are among our most valued customers and we look forward to new opportunities to work with them and serve their needs.
Going forward, we believe we are well-positioned to continue delivering strong results from the security division.
Moving on to the healthcare division, Spacelabs, where revenues increased by 4% in the quarter, an increase primarily attributable to a small, strategic acquisition completing during the quarter. Our patient monitoring business picked up in the North America market, but was offset by continued weakness in Europe.
There was also several orders from customers coming late in the quarter that did not convert to sales in Q1 and got pushed to Q2. We continued to make headway with our recently launched healthcare products and our new platform, the anesthesia workstation, ARKON.
In our ongoing efforts to broaden our offering in healthcare, we recently made an acquisition to enhance our cardiology product line. We acquired an international designer and manufacturer or automated external (technical difficulty) [AED]. The acquired product line is marketed and sold only outside of US.
AEDs, as you know, are used to revise individuals suffering from cardiac arrest and can be used at various settings, such as emergency rooms, hospitals, airports, shopping malls, cruise ships, and public events. This acquisition expands our cardiology line and will allow us to develop new products resulting from the integration of our patient monitoring solutions with the AEDs. We look forward to integrating this new business over the next few quarters and anticipate it will be accretive to earnings in fiscal 2016.
Moving to our Optoelectronic division, where revenues declined slightly from the prior fiscal year first quarter. Q1 2015 is a tough revenue growth comparison with Q1 2014, when we grew about 25%, which was including some significant sales to one customer who had launched an international channel for its products and needing to establish initial inventory levels.
We also chose to phase out certain low-margin accounts. Therefore, we will focus on improving operating margins throughout the Opto division and the trend towards a more favorable product mix.
I would like to thank our employees in delivering a good start to the new fiscal year and are excited about our future and look forward to the coming quarters. With that I'm going to hand over the call back to Alan to talk in detail about our financial performance before opening the call for questions. Thank you.
Alan Edrick - EVP & CFO
Thank you, Deepak. Our ongoing effort to deliver meaningful revenue and earnings growth through higher-margin growth initiatives and operating improvements continues to prove successful. Let's review in greater detail the financial results for the first quarter of the fiscal year before discussing our updated fiscal 2015 guidance.
As mentioned earlier, our revenues in the first quarter increased 6% over Q1 of fiscal 2014. This was primarily due to the 17% revenue growth in the quarter in our security division, resulting from strengthen our core baggage and parcel inspection products, new product launches, and in the partial fulfillment of the large FMS contract entered into in June of 2014.
Our Opto division's revenues decreased 3% as a result of lower contract manufacturing sales, given a tough comp that Deepak just alluded to due to a large international stocking order in the prior year, offset partially by strong intercompany sales.
Revenues in our healthcare division increased a modest 4%, resulting from the acquisition of the cardiology business that Deepak just mentioned. While sales in North America to the hospital market improved, softness in Europe offset such gains. Healthcare bookings picked up with a book-to-bill ratio of 1.2 in Q1 providing a cautious degree of optimism.
Our gross margin came in at 34%, an increase of 110 basis points as compared to Q1 in the prior year. This improvement was driven by a number of factors including: one, the growth of security revenues and a favorable product mix; and, two, the impact of the decrease in revenue in our Opto division, which typically carries the lowest gross margin of the Company's three divisions. As mentioned on previous calls, the margin will fluctuate from period to period based on revenue mix, amongst other factors.
Moving to OpEx, in Q1 of fiscal 2015, SG&A as a percentage of sales decreased to 20.2% as compared to 20.5% in the prior year. In absolute dollars the increase in SG&A of $2 million supported the 6% sales growth. Our goal continues to be to hold the SG&A growth rates below the rate of sales growth, though individual quarters may vary from this. We remain committed in all of our divisions to increasing efficiencies and managing our cost structure prudently.
We continue to invest significant resources in R&D to enhance our security and our healthcare product offerings. Our R&D spending of $12.7 million in Q1 was up 15% from the prior year, mainly due to increased spending to support our next generation of products in our security division. We expect an elevated level of R&D spending in fiscal 2015 as we develop innovative technologies to broaden our product offerings and enhance future growth.
Our effective tax rate for Q1 was 28.8% as compared to 29% in the same quarter of the prior year. Our provision for income taxes is dependent on the mix of income from US and foreign locations due to tax rate differences among countries, as well as the impact of permanent taxable differences, tax elections, and valuation allowances amongst other items.
As we move down the income statement, our Q1 GAAP diluted EPS was $0.55, a new record. The Q1 non-GAAP EPS per diluted share, which excludes restructuring and other charges, was $0.57, also a new record, compared to $0.46 in the comparable prior-year period, a 24% improvement.
I will next turn to a discussion of our operating margin, excluding restructuring and other charges. The Q1 adjusted operating margin was 8% compared to 7.1% in the prior year. The Security division reported an operating margin of 15.2%, improving from 13.6% in Q1 last year.
As mentioned in our previous calls, we expected to see a sequential increase in Opto's operating margin. This again proved to be true as Opto's adjusted operating margin increased from 6.2% in Q4 to 6.5% in Q1.
Finally, in healthcare, given flat organic sales, we recorded an (technical difficulty). As you may recall, healthcare is our highest contribution margin business and, thus, the bottom line is extremely sensitive to revenue increases and decreases. For the Company overall, adjusted EBITDA margins for Q1 increased year-over-year from 16.1% to 18.8%, driven mainly by strength in our security division.
Moving to cash flow. For Q1 of fiscal 2015 we reported operating cash flow of $31.5 million. Capital expenditures totaled approximately $3.1 million in Q1, while depreciation and amortization was $17.7 million. Days sales outstanding, or DSO, was 65 days in Q1 of fiscal 2015 compared to 91 days last year. Our level of DSO frequently fluctuates significantly from period to period.
We repurchased nearly 400,000 shares through our share repurchase program and net settlements totaling $24.9 million. Our balance sheet is strong and our leverage ratio remains well below 1. Our credit facility continues to provide the Company with flexibility to execute our business plan.
And finally, turning to our fiscal 2015 guidance, we are increasing our revenue guidance in fiscal 2015 to be between $970 million and $995 million. We are slightly increasing our guidance for fiscal 2015 non-GAAP diluted earnings per share, which excludes the impact of impairment, restructuring, and other charges, to $3.53 to $3.76. We currently believe the sales and earnings guidance reflects reasonable estimates. However, actual sales and earnings could vary from this range because of the risks and uncertainties applicable to our business and industry.
During the past few years we have built a strong foundation for growth and have consistently delivered a strong bottom line, along with significant operating and free cash flow. Our investments have enabled us to become the leader in turnkey screening solutions and allowed us to introduce innovative products and services to the market. We look forward to sharing our progress on upcoming calls.
Thank you for listening to this call and at this time we would like to open the call to questions.
Operator
(Operator Instructions) Josephine Millward, Benchmark Company.
Josephine Millward - Analyst
Can you give us your security bookings during the quarter or a breakdown of your backlog between Security and non-Security?
Alan Edrick - EVP & CFO
Josephine, this is Alan. Our book-to-bill ratio for Security excluding turnkey was 0.9, so it was pretty healthy bookings. As you know, we don't break down the backlog specifically between the various divisions, but our backlog did approximate about $800 million.
Josephine Millward - Analyst
Sorry, I missed the book-to-bill. Did you say 0.9?
Alan Edrick - EVP & CFO
That's correct, excluding our turnkey business.
Josephine Millward - Analyst
Okay. Can you give us an update on Mexico, how that's progressing; whether you expect to hit full run rate this year?
Deepak Chopra - Chairman & CEO
Josephine, I think what we said in the last conference call, Alan said that, that we are pretty much to the level of full operation. Obviously there can always be a little bit of improvement, but the present numbers basically reflect on going forward what the present expectations of the revenue is in the Mexico contract unless there is any increase in the number of locations as they move forward. But we are looking at it as if we have reached the full load.
Alan, do you want anything?
Alan Edrick - EVP & CFO
I think that's a good assessment, yes.
Josephine Millward - Analyst
So just to clarify, that's roughly $135 million a year for Mexico at almost 100% run rate?
Alan Edrick - EVP & CFO
At a run rate based on where we are going today, it would be just a little bit south of that, yes.
Josephine Millward - Analyst
Great. And last question; if you give us an update on Albania, whether we could hear about a resolution anytime soon.
Deepak Chopra - Chairman & CEO
Josephine, you know our position; anything that is not definite we never talk about it. All we can say is we are continuing to work the issues out and hopefully have reached to an amiable conclusion.
Josephine Millward - Analyst
Okay. Thanks, Deepak.
Operator
Brian Ruttenbur, CRT Capital.
Brian Ruttenbur - Analyst
Thank you very much, great quarter. Couple questions. First of all, housekeeping on Alan. On the share buyback you bought 400,000 shares; what was the average price?
Alan Edrick - EVP & CFO
We haven't gotten to that specifically, Brian, but you could probably do the math a little bit. We spent roughly $25 million and we bought just south of 400,000 shares, so you could see it would be in the (multiple speakers).
Brian Ruttenbur - Analyst
Right around $60? Yes, right around $60. Okay, I didn't know if you had an exact calculation.
I guess the buyback that you have in place right now account for, I believe, what, another $51 million? Is that right? Or $50 million?
Alan Edrick - EVP & CFO
Yes, we do have an authorized program for a number that's probably a little bit above the amount you just described.
Brian Ruttenbur - Analyst
Okay. Maybe turning over to Deepak. In terms of your plan for buybacks, you are going to generate, at least according to us on the Street, north of $100 million of free cash flow this year. Is there plans to expand that buyback? Is there plans to use leverage to increase the buyback?
Deepak Chopra - Chairman & CEO
Brian, you know that it's a subject that we continue to look at it and from time to time we buy. I am not going to go into any details. Obviously, we have a strong balance sheet and we look at all the opportunities -- buyback, acquisitions, turnkey services, and whatever. But we do look at it; Alan and I and the Board are very sensitive to it and from time to time we are very much focused into this particular subject.
Brian Ruttenbur - Analyst
Okay. And then in terms of your acquisition, can you talk about how much you paid for that recent healthcare acquisition?
Alan Edrick - EVP & CFO
Brian, this is Alan. We paid roughly $9 million.
Brian Ruttenbur - Analyst
$9 million, okay. Is that why there was an increase in your bank line from last quarter to this quarter?
Alan Edrick - EVP & CFO
Yes, the increase in the bank line was just related to the timing. A little bit with the acquisition, a little bit would be the stock buyback we just talked about and in general working capital, yes.
Brian Ruttenbur - Analyst
Then in terms of the FMS order in Iraq, can you -- I think you shipped last quarter in June 11 units. Are you talking in number of units that you've shipped this quarter and any kind of projections for the next couple quarters?
Alan Edrick - EVP & CFO
Brian, this is Alan. I guess what we could describe is, as we said on the last call, the Q1 would be a bit less than the Q4 and that proved to be true. We recognized revenues of roughly $14 million, $15 million from FMS in Q1.
And also, as we mentioned last quarter, we thought Q2 would pick up. While we don't want to the precise number, we do think it will be above the Q1 number.
Brian Ruttenbur - Analyst
Okay, great. Thank you very much.
Operator
Jeff Martin, ROTH Capital Partners.
Jeff Martin - Analyst
Alan, can you give us an idea of what kind of revenue run rate the AED acquisition has at close and what day did it close?
Deepak Chopra - Chairman & CEO
Would you repeat that again, Jeff?
Jeff Martin - Analyst
What's the revenue run rate of the acquired AED business that you just bought?
Deepak Chopra - Chairman & CEO
About $16 million to $20 million, but it's basically varies. And I think, Alan, we had, what, one month into it?
Alan Edrick - EVP & CFO
Yes, Jeff, we just had a short time. We purchased it midway through the quarter.
Jeff Martin - Analyst
Okay. And then is that a product you're going to bring into the domestic market?
Alan Edrick - EVP & CFO
No, our plan for that product line is really on an international basis, so we're really focused on our distributor network and some of our channels outside the United States.
Jeff Martin - Analyst
Okay. Then is your higher guidance essentially accounting for the acquisition?
Alan Edrick - EVP & CFO
That is correct.
Jeff Martin - Analyst
And then EPS is just a little better just operationally?
Alan Edrick - EVP & CFO
That's correct as well.
Jeff Martin - Analyst
Okay. You had been in the past talking about ramping up production for ARKON. Are you still ramping that? Are you producing units? How is ARKON coming along?
Deepak Chopra - Chairman & CEO
The answer is yes. We continue to go into production and we think that there will be relatively more contribution into the revenue in the second half of this year compared to before with the ARKON product line.
Jeff Martin - Analyst
Okay. And then in terms of the government-mandated replacement of airport screening equipment, do you have any trends that are worth noting in terms of that starting to come more into light? Do you have expectations that that will start to kick in more this year and what's your view there?
Deepak Chopra - Chairman & CEO
It's watch and see all over the world. The US is different than the rest of the world. We look at it very closely, but there is no specific trends that we look at which is going to change anything differently, significantly.
Jeff Martin - Analyst
Okay. And then, Alan, I didn't cash the cash flow from operations number. Could you give that again, please?
Alan Edrick - EVP & CFO
Sure, it was $31.5 million.
Jeff Martin - Analyst
Great. Thanks, nice quarter, guys.
Operator
(Operator Instructions) William Lee, Oppenheimer.
William Lee - Analyst
Good morning, guys. If I look at the margins in Rapiscan in the first quarter it looks really strong. Can you maybe parse out how much of this is from the equipment sales, how much is from turnkey? And how should we think about the margins on FMS business? Is this driving part of the improvement?
Alan Edrick - EVP & CFO
Will, this is Alan. Thanks for the question. As you know, we don't break out our margins by various product lines or business areas within the division. We were very pleased with the margin improvement in the Security business and FMS certainly contributed to that.
William Lee - Analyst
Right, right. But if we think about in terms of Mexico, Mexico this quarter and last quarter were pretty much at full run rate. Is that fair?
Alan Edrick - EVP & CFO
The Mexico revenues were not significantly different in Q1 from Q4. That is a fair statement.
William Lee - Analyst
Okay, great. And you also mentioned that CapEx this year is going to be elevated. How should we think about it? Is this something where it's going to be comparable to last year or is it going to still be down year-over-year?
Alan Edrick - EVP & CFO
Will, I think my comment was referring to R&D, that R&D would be a bit higher than it was last year. CapEx we anticipate be down year-over-year, absent new turnkey wins, which we, of course, hope to win.
William Lee - Analyst
Okay, great. That's all I have.
Operator
Josephine Millward, Benchmark.
Josephine Millward - Analyst
Thanks for taking my question. Deepak, can you talk about your security pipeline and the macro environment? As you know, most of your competitors appear to be struggling. If you can comment on that, your outlook in general.
Deepak Chopra - Chairman & CEO
Josephine, as Alan mentioned, non-turnkey our bookings on Q1 were very good, 0.9 book to bill. We look at -- especially in the international sector, we are not seeing something what some of these other competitors have reported. And we basically attribute that to we have a very broad product line and that has always been our strategy, and we have a very broad global reach. And that does help.
We look at it that the pipeline continues to be robust. Our guideline reflects that. We look at it that the international arena especially we have been very (technical difficulty).
Josephine Millward - Analyst
Okay, thanks. On RTT, I [understand] you're currently bidding on international projects. Do you think we could see some deliveries this year, this fiscal year?
Deepak Chopra - Chairman & CEO
The answer is definitely, yes, there would be some deliveries. I just want make sure that you don't -- because we already have booked orders, so what it means here is that we will have deliveries. That's one part of your question. And we also said in my script that we expect, anticipate some new bookings in the RTT product line internationally in the remainder of the year.
Josephine Millward - Analyst
That's great. One final question. I think, Alan, you mentioned that new product launch in Security was one of the growth drivers. Can you expand on that and talk about what the new product was in Security?
Alan Edrick - EVP & CFO
Sure, Josephine. We launched a product, a small product in the trace detection area called DETECTRA, which we are looking forward to getting some market penetration throughout that area. So we will call it a smaller product line, but it is an attractive product line that goes well into the sales mix and fits right into the bag of tricks for our sales channel and our distributors.
Deepak Chopra - Chairman & CEO
Just to add on to it, we also have introduced additional mobile cargo products in the low-energy mode and we are very excited about it.
Josephine Millward - Analyst
Sounds good. Thank you very much.
Operator
At this time we have no further questions. I will now turn the call over to Mr. Deepak Chopra for closing remarks.
Deepak Chopra - Chairman & CEO
Thank you very much. I would like to thank everyone for joining our call. We look forward to speaking with you again on our next call. We continue to remain optimistic and very excited about our year and are looking forward to talking to you next quarter call. Thank you.
Operator
Ladies and gentlemen, that concludes today's conference. Thank you for your participation. You may now disconnect and have a great day.