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Fair Value Measurements - Additional Information (Detail) - USD ($)	Aug. 31, 2025	May 31, 2025
Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 0
Long-term Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt at fair value including current maturities	276,990,000	$ 263,547,000
Long-term debt at carrying amount	$ 306,010,000	$ 302,868,000

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