Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024	Jun. 04, 2025	Jun. 03, 2024	Mar. 26, 2024	Jan. 04, 2024
Class of Stock [Line Items]
Stock repurchase program, authorized amount	$ 300.0		$ 300.0		$ 150.0	$ 100.0	$ 100.0	$ 100.0
Stock repurchase program, authorized remaining repurchase amount		$ 300.0		$ 300.0
Reversal of excise tax		$ 0.1
Excise tax accrued	$ 0.0		$ 1.0	$ 2.0
Common Class A
Class of Stock [Line Items]
Common stock repurchased and retired, (in shares)	1,121,854	0	17,616,548	25,460,052
Stock repurchases during period	$ 9.9		$ 150.4	$ 271.0