Convertible Senior Notes (Tables)

12 Months Ended

Jan. 31, 2020

Debt Disclosure [Abstract]

Schedule of Convertible Debt

The net carrying value of the liability component of the Notes was as follows:

	January 31,
(in thousands)	2020		2019
Principal	$	575,000	$	575,000
Less: unamortized debt discount	(101,461)		(125,872)
Less: unamortized transaction costs	(8,218)		(10,196)
Net carrying amount	$	465,321	$	438,932

The net carrying amount of the equity component of the Notes was as follows:

(in thousands)	January 31, 2020 and 2019
Proceeds allocated to the conversion option (debt discount)	$	134,667
Less: transaction costs	(3,336)
Net carrying amount	$	131,331

The interest expense recognized related to the Notes was as follows:

	Year Ended January 31,
(in thousands)	2020		2019
Contractual interest expense	$	2,865	$	1,071
Amortization of debt discount	24,411		8,795
Amortization of transaction costs	1,978		712
Total	$	29,254	$	10,578