Defined Benefit Pension Settlement (Details) - USD ($) $ in Millions	6 Months Ended
	Nov. 30, 2023	Nov. 30, 2022
Defined Benefit Pension Settlement
Non-cash, pre-tax pension settlement charge	$ 26.7
Non-cash, after-tax pension settlement charge	$ 16.1
Excise tax upon withdrawal from the plan (as a percent)	20.00%
Surplus plan assets, classified as Other non-current assets		$ 6.9