Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	May 31, 2024	May 31, 2023
Deferred tax assets
Accounts receivable	$ 1.8	$ 1.3
Inventories	2.8	3.4
Accrued expenses	9.2	14.1
Net operating loss carry forwards	2.8	3.2
Stock-based compensation	1.9	3.4
Operating lease - liability	4.4	2.3
Derivative contracts	0.2	1.5
Other	1.5	0.1
Deferred tax assets before valuation allowance	24.6	29.3
Less: Valuation allowance	0.0	0.0
Total deferred tax assets	24.6	29.3
Deferred tax liabilities
Property, plant and equipment	(28.7)	(33.0)
Investment in affiliated companies, principally due to undistributed earnings	(10.5)	(12.1)
Operating lease - ROU assets	(4.2)	(2.1)
Other	(0.6)	(1.9)
Total deferred tax liability	(44.0)	(49.1)
Net deferred tax asset (liability)	$ (19.4)	$ (19.8)