Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 292,889	$ 250,373	$ 584,853	$ 293,603
Provision for income taxes	$ 73,874	$ 68,399	$ 149,530	$ 96,185
Effective tax rate	25.20%	27.30%	25.60%	32.80%