Income Taxes (Details 2) - USD ($) $ in Thousands	Jan. 31, 2023	Jan. 31, 2022
Deferred tax assets:
Net operating loss carryforwards	$ 661,859	$ 730,071
Capitalized research & development costs	387,755	285,181
Tax credit carryforwards	314,568	264,968
Stock-based compensation	57,934	57,438
Operating lease liabilities	50,659	57,459
Accrued liabilities	29,921	45,617
Convertible senior notes	22,245	0
Deferred revenue	15,590	22,142
Interest deduction carryforward	0	15,060
Other	7,007	5,645
Valuation allowance	(1,408,007)	(1,180,117)
Total deferred tax assets	139,531	303,464
Deferred tax liabilities:
Deferred commissions	(72,635)	(61,919)
Operating lease right-of-use assets	(39,417)	(49,176)
Depreciation and amortization	(22,122)	(35,481)
Convertible senior notes	0	(152,205)
Total deferred tax liabilities	(134,174)	(298,781)
Net deferred tax assets	5,357	4,683
Recorded as:
Non-current deferred tax assets	7,129	5,049
Non-current deferred tax liabilities	(1,772)	(366)
Net deferred tax assets	$ 5,357	$ 4,683