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Convertible Senior Notes, Net (Tables)

3 Months Ended

Apr. 30, 2019

Debt Disclosure [Abstract]

Schedule of Senior Notes

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

	April 30, 2019								January 31, 2019
	2020 Notes				2022 Notes				2020 Notes				2022 Notes
Principal amounts:
Principal	$	249,975			$	1,150,000			$	249,975			$	1,150,000
Unamortized debt discount	(13,755		)		(156,720		)		(16,480		)		(167,249		)
Unamortized debt issuance costs	(812		)		(9,773		)		(981		)		(10,487		)
Net carrying amount	$	235,408			$	983,507			$	232,514			$	972,264
Carrying amount of the equity component (1)	$	66,007			$	219,702			$	66,007			$	219,702

⁽¹⁾  Included on the condensed consolidated balance sheets within Additional paid-in capital, net of $2 million and $4 million for the 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 April 30,
	2019												2018
	2018 Notes				2020 Notes				2022 Notes				2018 Notes				2020 Notes				2022 Notes
Contractual interest expense	$	—			$	937			$	719			$	656			$	937			$	719
Interest cost related to amortization of debt issuance costs	—				169				714				352				168				714
Interest cost related to amortization of the debt discount	—				2,725				10,529				4,283				2,561				10,061

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Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components.

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