Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands	May 31, 2021	May 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt at carrying amount including current maturities	$ 713,479
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	792,632	$ 740,678
Long-term debt at carrying amount including current maturities	$ 710,489	$ 699,665