Debt (Tables)

12 Months Ended

Jan. 31, 2021

Debt Disclosure [Abstract]

Convertible Debt

The Notes consisted of the following (in thousands):

	At the End of Fiscal
	2020		2021
Liability:
Principal	$	575,000	$	575,000
Less: debt discount, net of amortization	(91,378)		(64,515)
Less: debt issuance costs, net of amortization	(6,615)		(4,671)
Net carrying amount of the Notes	$	477,007	$	505,814
Stockholders' equity recorded at issuance:
Allocated value of the conversion feature			$	136,333
Less: debt issuance costs			(3,068)
Additional paid-in capital			$	133,265

Interest Expense

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

	Fiscal Year Ended
		2020			2021
Amortization of debt discount		$	25,344		$	26,863
Amortization of debt issuance costs		1,835			1,944
Total amortization of debt discount and debt issuance costs		27,179			28,807
Contractual interest expense		718			718
Total interest expense related to the Notes		$	27,897		$	29,525
Effective interest rate of the liability component		5.6		%	5.6		%