Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Income Tax Disclosure [Abstract]
Income before provision for (benefit from) income taxes	$ 410,283	$ 194,021	$ 963,098	$ 413,381
Provision for (benefit from) income taxes	$ 69,900	$ (4,621)	$ 78,100	$ 1,675
Effective tax rate	17.00%	(2.40%)	8.10%	0.40%