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Derivative Financial Instruments and Hedging Activities - Commodity Derivatives (Details) - Commodity derivatives - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Cost of goods sold        
Derivative [Line Items]        
Pretax gains (losses) reclassified from AOCI related to cash flow hedges $ 4,082 $ 2,126 $ 16,755 $ 6,978
Cash Flow Hedging        
Derivative [Line Items]        
Pretax gains (losses) recorded in OCI related to cash flow hedges $ (2,084) $ (8,130) $ (110) $ (15,233)