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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	20 Months Ended
	Nov. 30, 2024	Aug. 31, 2024	Nov. 30, 2025	Nov. 30, 2025	Mar. 19, 2025	Mar. 20, 2024
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased			$ 108.0	$ 108.0
Less repurchases made under these authorizations	$ (5.0)	$ (5.0)
Remaining Board authorization at November 30, 2025			70.0	70.0
Board Authorized 2024 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased						$ 54.6
Under all Board Authorizations
Equity, Class of Treasury Stock [Line Items]
Less repurchases made under these authorizations			$ 0.0	$ (38.0)
Board Authorized March 2025 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased					$ 53.4