Income Taxes - Additional Information (Detail) - 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]
Effective tax rates	20.70%	7.40%	15.90%	4.00%
Excess tax benefits recognized	$ 10,404	$ 17,329	$ 45,464	$ 59,067