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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Aug. 31, 2021
Aug. 31, 2020
Carrying (Reported) Amount, Fair Value Disclosure    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable [1] $ 913,815 $ 832,126
Estimate of Fair Value, Fair Value Disclosure    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable $ 935,917 $ 802,324
[1] Carrying amount disclosed in this table excludes debt discount and debt issuance costs.