Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 143,672	$ 228,931
Provision for income taxes	$ 30,014	$ 1,400
Effective tax rate (as a percent)	20.90%	0.60%