6. Borrowings

Revolving Credit Facility

In December 2016, we entered into an amendment to our revolving credit facility, which, among other things, increased the aggregate committed amount available to us from $450 million to $525 million and extended the maturity date to December 2021. The credit facility includes a $300 million sub-limit for letters of credit. Under certain circumstances, we have the ability to increase the facility by the greater of $250 million or such amount as would not cause our secured leverage ratio to exceed a specified level. Borrowings under this facility bear interest at LIBOR plus a margin of 1.25% as of September 30, 2017, but this margin can range from 1.25% to 2.0% based on our consolidated net leverage ratio as defined in the credit facility. Letters of credit reduce the amount available to borrow by their face value. The unused portion of the facility bears a commitment fee of 0.20% as of September 30, 2017, but this fee can range from 0.20% to 0.30% based on our consolidated net leverage ratio as defined in the credit facility. Due to increased borrowings under this facility as a result of the acquisition of ETD, the borrowing margin is scheduled to increase to 1.50% during the second quarter of fiscal 2018. Our borrowings under the credit agreement are guaranteed by certain of our U.S. based subsidiaries and are secured by substantially all of our and certain subsidiaries’ assets. The agreement contains various representations and warranties, affirmative, negative and financial covenants and conditions of default customary for financing agreements of this type. As of September 30, 2017, there was $214.0 million of borrowings outstanding under the revolving credit facility and $33.1 million outstanding under the letters of credit sub facility. The amount available to borrow under the credit facility as of September 30, 2017 was $277.9 million. Under the terms of the revolving credit facility, loan amounts may be borrowed, repaid and re-borrowed during the term. Although the principal amount of each revolving loan is due and payable in full on the maturity date, we have the right to repay each revolving loan in whole or in part from time to time without penalty. It is our practice to routinely borrow and repay several times per year under this revolving facility. Therefore, borrowings under the credit facility are included in current liabilities. As of September 30, 2017, we are in compliance with all covenants under this credit facility.

1.25% Convertible Senior Notes Due 2022

In February 2017, we issued $287.5 million of 1.25% convertible senior notes due 2022 (the “Notes”) in a private offering. The Notes are governed by an indenture dated February 22, 2017. The maturity for the payment of principal is September 1, 2022. The Notes bear interest at the rate of 1.25% and are payable in cash semiannually in arrears on each March 1 and September 1, commencing on September 1, 2017. The Notes are senior unsecured obligations and rank senior in right of payment to any of our indebtedness that is expressly subordinated in right of payment to the Notes; equal in right of payment to any of our unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of our secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of OSI Systems, Inc. and our subsidiaries, as well as any of the existing and future indebtedness that may be guaranteed by our subsidiaries to the extent of such guarantee (including the guarantees of certain of our subsidiaries under our existing revolving credit facility).

The Notes are convertible prior to March 1, 2022 only upon specified events and during specified periods and are, thereafter convertible, at any time, in each case at an initial conversion rate of 9.3056 per $1,000 principal amount of the Notes, which is equal to an initial conversion price of approximately $107.46 per share or a 38.5% premium to our stock price at the time of the issuance. The conversion rate is subject to adjustment upon certain events. Upon conversion, the Notes may be settled, at our election, in shares of our Common Stock, cash or a combination of cash and shares of Common Stock. We have initially elected a combination settlement method to satisfy the conversion obligation, which allows us to settle the principal amount of the Notes in cash and to settle the excess conversion value, if any, in shares, as well as cash in lieu of fractional shares.

We may not redeem the Notes prior to March 6, 2020. Thereafter, we may redeem the Notes if the last reported sale price of our Common Stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any period of 30 consecutive trading days. If we undergo a fundamental change, as defined in the indenture for the Notes, subject to certain conditions, holders of the Notes may require us to repurchase all or part of the Notes for cash at a price equal to 100% of the principal amount of the Notes to be repurchased, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date. The occurrence of a fundamental change will also result in the Notes becoming immediately convertible.

Pursuant to ASC 470-20, we allocated the $287.5 million gross proceeds of the Notes between liability and equity components. The initial $242.4 million liability component was determined based on the fair value of similar debt instruments excluding the conversion feature for similar terms and priced on the same day the Notes were issued. The initial $45.1 million equity component represents the debt discount and was calculated as the difference between the fair value of the debt and the gross proceeds of the Notes. Issuance costs of $7.7 million were allocated between debt ($6.5 million) and equity ($1.2 million) components with the portion allocated to the debt presented as an offset against long term debt in the consolidated balance sheet and is amortized as interest expense over the life of the Notes using the effective interest method. The total interest expense recognized for three months ended September 30, 2017 was $3.0 million, which consists of $0.9 million of contractual interest expense, $1.8 million of amortization of the debt discount and $0.3 million of amortization of debt issuance costs. As of September 30, 2017, the unamortized debt discount was $40.8 million and is being amortized over the remaining contractual term to maturity of the Notes using an effective interest rate of 4.50%. The unamortized debt issuance cost of $5.8 million as of September 30, 2017 is amortized on a straight-line basis, which approximates the effective interest method, over the life of the Notes. Based on our September 30, 2017 stock price of $91.37 per share, the “if-converted” value of the Notes did not exceed the principal amount.

Other Borrowings

Several of our foreign subsidiaries maintain bank lines-of-credit, denominated in local currencies and U.S. dollars, primarily for the issuance of letters-of-credit. As of September 30, 2017, $61.1 million was outstanding under these letter-of-credit facilities. As of September 30, 2017, the total amount available under these credit facilities was $13.6 million.

In September 2012, we entered into a seven year term loan agreement for $11.1 million to fund the acquisition of land and a building in the state of Washington. The loan, which bears interest at LIBOR plus 1.25%, is payable on a monthly basis over seven years. Concurrent with entering into the floating rate loan, we entered into an interest rate swap agreement that effectively locks the interest rate of the loan to 2.2% per annum for the term of the loan.

Long-term debt consisted of the following (in thousands):

	June 30, 2017			September 30, 2017
1.25% convertible notes due 2022:
Principal amount	$	287,500		$	287,500
Unamortized discount	(42,602		)	(40,799		)
Unamortized debt issuance costs	(6,073		)	(5,779		)

1.25% convertible notes due 2022, net of unamortized discount and debt issuance costs	238,825			240,922
Term loans	3,700			3,304
Other long-term debt	1,621			1,476

	244,146			245,702
Less current portion of long-term debt	(2,396		)	(2,286		)

Long-term portion of debt	$	241,750		$	243,416