Comprehensive Income (Loss) - Components of Changes in AOCI (Detail) - USD ($) $ in Millions		12 Months Ended
		May 31, 2025	May 31, 2024	May 31, 2023
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		$ 1,117.5	$ 1,154.6	$ 1,266.4
Income tax effect		(0.3)	0.9	(0.9)
Balance		1,197.9	1,117.5	1,154.6
Foreign Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		(11.9)	(10.6)
Other comprehensive income (loss) before reclassifications		1.2	(1.3)
Reclassification adjustments to income	[1]	0.0	0.0
Income tax effect		0.0	0.0
Balance		(10.7)	(11.9)	(10.6)
Pension Liability Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		8.4	6.0
Other comprehensive income (loss) before reclassifications		1.8	3.5
Reclassification adjustments to income	[1]	(3.2)	(0.4)
Income tax effect		0.3	(0.7)
Balance		7.3	8.4	6.0
Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		(2.6)	2.5
Other comprehensive income (loss) before reclassifications		(4.8)	1.6
Reclassification adjustments to income	[1]	7.4	(8.3)
Income tax effect		(0.6)	1.6
Balance		(0.6)	(2.6)	2.5
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		(6.1)	(2.1)	1.9
Other comprehensive income (loss) before reclassifications		(1.8)	3.8
Reclassification adjustments to income	[1]	4.2	(8.7)
Income tax effect		(0.3)	0.9
Balance		$ (4.0)	$ (6.1)	$ (2.1)

[1] The statement of earnings classification of amounts reclassified to net income include: a. Cash flow hedges – disclosed in “Note 16 – Derivative Financial Instruments and Hedging Activities”; and b. Pension liability adjustment – reflects the following pension liability adjustments as disclosed in “Note 12 – Employee Retirement Plans” i. Amortization of net (gain) loss of the Pension Benefits and Other Benefits. ii. The acceleration of deferred pension costs in AOCI related to the pension plan lift-out transaction to transfer a portion of the total projected benefit obligation of the Tempel pension plan to a third-party insurance company.