Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 448,162	$ 292,889	$ 763,927	$ 584,853
Provision for income taxes	$ 89,570	$ 73,874	$ 150,732	$ 149,530
Effective tax rate	20.00%	25.20%	19.70%	25.60%