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Convertible Senior Notes, Net (Tables)

9 Months Ended

Oct. 31, 2018

Debt Disclosure [Abstract]

Schedule of Senior Notes

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



	October 31, 2018												January 31, 2018
	2018 Notes				2020 Notes				2022 Notes				2018 Notes				2020 Notes				2022 Notes
Principal amounts:
Principal	$	—			$	249,997			$	1,150,000			$	350,000			$	250,000			$	1,150,000
Unamortized debt discount	—				(19,163		)		(177,659		)		(7,850		)		(26,968		)		(208,188		)
Unamortized debt issuance costs	—				(1,150		)		(11,202		)		(641		)		(1,654		)		(13,345		)
Net carrying amount	$	—			$	229,684			$	961,139			$	341,509			$	221,378			$	928,467
Carrying amount of the equity component ⁽¹⁾	$	74,887			$	66,007			$	219,702			$	74,892			$	66,007			$	219,702


⁽¹⁾	Included on the condensed consolidated balance sheets within Additional paid-in capital, net of $2 million, $2 million, and $4 million for the 2018 Notes, 2020 Notes, and 2022 Notes, respectively, in equity issuance costs.

Schedule of Interest Expense Recognized Related to Convertible Senior Notes

The following table sets forth total interest expense recognized related to the Notes (in thousands):



	Three Months Ended October 31,																								Nine Months Ended October 31,
	2018												2017												2018												2017
	2018 Notes				2020 Notes				2022 Notes				2018 Notes				2020 Notes				2022 Notes				2018 Notes				2020 Notes				2022 Notes				2018 Notes				2020 Notes				2022 Notes
Contractual interest expense	$	—			$	937			$	718			$	656			$	938			$	367			$	1,196			$	2,812			$	2,156			$	1,969			$	2,813			$	367
Interest cost related to amortization of debt issuance costs	—				167				714				352				168				365				641				504				2,143				1,056				503				365
Interest cost related to amortization of the debt discount	—				2,643				10,293				4,162				2,482				5,042				7,850				7,805				30,529				12,310				7,332				5,042