Convertible Senior Notes, Net

Convertible Senior Notes

In June 2013, we issued 0.75% convertible senior notes due July 15, 2018 ("2018 Notes") with a principal amount of $350 million. The 2018 Notes are unsecured, unsubordinated obligations, and interest is payable in cash in arrears at a fixed rate of 0.75% on January 15 and July 15 of each year. The 2018 Notes mature on July 15, 2018 unless repurchased or converted in accordance with their terms prior to such date. We cannot redeem the 2018 Notes prior to maturity.

Concurrently, we issued 1.50% convertible senior notes due July 15, 2020 ("2020 Notes") with a principal amount of $250 million (together with the 2018 Notes, referred to as "the Notes"). The 2020 Notes are unsecured, unsubordinated obligations, and interest is payable in cash in arrears at a fixed rate of 1.50% on January 15 and July 15 of each year. The 2020 Notes mature on July 15, 2020 unless repurchased or converted in accordance with their terms prior to such date. We cannot redeem the 2020 Notes prior to maturity.

The terms of the Notes are governed by Indentures by and between us and Wells Fargo Bank, National Association, as Trustee ("the Indentures"). Upon conversion, holders of the Notes will receive cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at our election.

For the 2018 Notes, the initial conversion rate is 12.0075 shares of Class A common stock per $1,000 principal amount, which is equal to an initial conversion price of approximately $83.28 per share of Class A common stock, subject to adjustment. Prior to the close of business on March 14, 2018, the conversion is subject to the satisfaction of certain conditions as described below. For the 2020 Notes, the initial conversion rate is 12.2340 shares of Class A common stock per $1,000 principal amount, which is equal to an initial conversion price of approximately $81.74 per share of Class A common stock, subject to adjustment. Prior to the close of business on March 13, 2020, the conversion is subject to the satisfaction of certain conditions, as described below.

Holders of the Notes who convert their Notes in connection with certain corporate events that constitute a make-whole fundamental change (as defined in the Indentures) are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, in the event of a corporate event that constitutes a fundamental change (as defined in the Indentures), holders of the Notes may require us to repurchase all or a portion of their Notes at a price equal to 100% of the principal amount of the Notes, plus any accrued and unpaid interest.

Holders of the Notes may convert all or a portion of their Notes prior to the close of business on March 14, 2018 for the 2018 Notes and March 13, 2020 for the 2020 Notes, in multiples of $1,000 principal amount, only under the following circumstances:


•	if the last reported sale price of Class A common stock for at least twenty trading days during a period of thirty consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price of the respective Notes on each applicable trading day;


•	during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the respective Notes for each day of that five day consecutive trading day period was less than 98% of the product of the last reported sale price of Class A common stock and the conversion rate of the respective Notes on such trading day; or


•	upon the occurrence of specified corporate events, as noted in the Indentures.

In accounting for the issuance of the Notes, we separated each of the Notes into liability and equity components. The carrying amounts of the liability components were calculated by measuring the fair value of similar liabilities that do not have associated convertible features. The carrying amount of the equity components representing the conversion option were determined by deducting the fair value of the liability components from the par value of the respective Notes. These differences represent debt discounts that are amortized to interest expense over the respective terms of the Notes. The equity components are not remeasured as long as they continue to meet the conditions for equity classification.

We allocated the total issuance costs incurred to the Notes on a prorated basis using the aggregate principal balances. In accounting for the issuance costs related to the Notes, we allocated the total amount of issuance costs incurred to liability and equity components. Issuance costs attributable to the liability components are being amortized to interest expense over the respective terms of the Notes, and the issuance costs attributable to the equity components were netted against the respective equity components in Additional paid-in capital. For the 2018 Notes, we recorded liability issuance costs of $7 million and equity issuance costs of $2 million. Amortization expense for the liability issuance costs was $0.4 million for each of the three month periods ended April 30, 2017 and 2016. For the 2020 Notes, we recorded liability issuance costs of $5 million and equity issuance costs of $2 million. Amortization expense for the liability issuance costs was $0.2 million for each of the three month periods ended April 30, 2017 and 2016.

The Notes, net consisted of the following (in thousands):



	April 30, 2017						January 31, 2017
	2018 Notes			2020 Notes			2018 Notes			2020 Notes
Principal amounts:
Principal	$	350,000		$	250,000		$	350,000		$	250,000
Unamortized debt discount⁽¹⁾	(20,336		)	(34,414		)	(24,380		)	(36,820		)
Net carrying amount before unamortized debt issuance costs	329,664			215,586			325,620			213,180
Unamortized debt issuance costs⁽¹⁾	(1,698		)	(2,159		)	(2,050		)	(2,327		)
Net carrying amount	$	327,966		$	213,427		$	323,570		$	210,853
Carrying amount of the equity component⁽²⁾	$	74,892		$	66,007		$	74,892		$	66,007


⁽¹⁾	Included in the condensed consolidated balance sheets within Convertible senior notes, net and amortized over the remaining lives of the Notes on a straight-line basis as it approximates the effective interest rate method.


⁽²⁾	Included in the condensed consolidated balance sheets within Additional paid-in capital, net of $2 million and $2 million for the 2018 Notes and 2020 Notes, respectively, in equity issuance costs.

As of April 30, 2017, the remaining life of the 2018 Notes and 2020 Notes is approximately 14 months and 38 months, respectively.

The effective interest rates of the liability components of the 2018 Notes and 2020 Notes are 5.75% and 6.25%, respectively. These interest rates were based on the interest rates of similar liabilities at the time of issuance that did not have associated convertible features. The following table sets forth total interest expense recognized related to the Notes (in thousands):



	Three Months Ended April 30,
	2017				2016
	2018 Notes		2020 Notes		2018 Notes		2020 Notes
Contractual interest expense	$	656	$	938	$	656	$	938
Interest cost related to amortization of debt issuance costs	352		168		352		167
Interest cost related to amortization of the debt discount	4,044		2,406		3,819		2,261

Notes Hedges

In connection with the issuance of the Notes, we entered into convertible note hedge transactions with respect to our Class A common stock ("Purchased Options"). The Purchased Options cover, subject to anti-dilution adjustments substantially identical to those in the Notes, approximately 7.3 million shares of our Class A common stock and are exercisable upon conversion of the Notes. The Purchased Options have initial exercise prices that correspond to the initial conversion prices of the 2018 Notes and 2020 Notes, respectively, subject to anti-dilution adjustments substantially similar to those in the Notes. The Purchased Options will expire in 2018 for the 2018 Notes and in 2020 for the 2020 Notes, if not earlier exercised. The Purchased Options are intended to offset potential economic dilution to our Class A common stock upon any conversion of the Notes. The Purchased Options are separate transactions and are not part of the terms of the Notes.

We paid an aggregate amount of $144 million for the Purchased Options, which is included in Additional paid-in capital in the condensed consolidated balance sheets.

Warrants

In connection with the issuance of the Notes, we also entered into warrant transactions to sell warrants ("the Warrants") to acquire, subject to anti-dilution adjustments, up to approximately 4.2 million shares in July 2018 and 3.1 million shares in July 2020 of our Class A common stock at an exercise price of $107.96 per share. If the Warrants are not exercised on their exercise dates, they will expire. If the market value per share of our Class A common stock exceeds the applicable exercise price of the Warrants, the Warrants will have a dilutive effect on our earnings per share assuming that we are profitable. The Warrants are separate transactions, and are not part of the terms of the Notes or the Purchased Options.

We received aggregate proceeds of $93 million from the sale of the Warrants, which is recorded in Additional paid-in capital in the condensed consolidated balance sheets.