Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 90,399	$ 323,884	$ 234,071	$ 552,815
Provision for income taxes	$ 44,649	$ 6,800	$ 74,663	$ 8,200
Effective tax rate (as a percent)	49.40%	2.10%	31.90%	1.50%