Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 280,412	$ 185,826	$ 865,265	$ 479,429
Provision for income taxes	$ 73,362	$ 44,614	$ 222,892	$ 140,799
Effective tax rate	26.20%	24.00%	25.80%	29.40%