Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 794,709	$ 280,412	$ 1,558,636	$ 865,265
Provision for income taxes	$ 181,836	$ 73,362	$ 332,568	$ 222,892
Effective tax rate	22.90%	26.20%	21.30%	25.80%