Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 250,373	$ 90,399	$ 293,603	$ 234,071
Provision for income taxes	$ 68,399	$ 44,649	$ 96,185	$ 74,663
Effective tax rate	27.30%	49.40%	32.80%	31.90%