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Fair Value - Additional Information (Detail) - Long-term Debt - USD ($)
$ in Thousands
Aug. 31, 2020
May 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt at fair value including current maturities $ 788,567 $ 740,678
Long-term debt at carrying amount including current maturities $ 707,491 $ 699,665