Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023	May 31, 2024
Income Taxes [Line Items]
Effective income tax expense rate	13.90%	25.50%	18.20%	25.30%
Corporate income tax rate	21.00%	21.00%	21.00%	21.00%
Increase in deferred income tax assets	$ 43,900,000
Deferred tax assets adjusted net amount	21,800,000
Deferred income tax liability	0		$ 0		$ 4,100,000
Unremitted foreign earnings	157,200,000		157,200,000		$ 285,600,000
Provision for deferred income taxes	0		$ 0
Minimum tax rate on reported profits			15.00%
U.S. Foreign Tax Credits
Income Taxes [Line Items]
Deferred tax assets valuation allowance	$ 22,100,000		$ 22,100,000