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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. 29, 2020
Feb. 28, 2019
Feb. 29, 2020
Feb. 28, 2019
Cost of goods sold        
Derivative [Line Items]        
Pretax gains (losses) reclassified from AOCI related to cash flow hedges $ 2,126 $ 6,102 $ 6,978 $ 8,002
Cash Flow Hedging        
Derivative [Line Items]        
Pretax gains (losses) recorded in OCI related to cash flow hedges $ (8,130) $ 14,170 $ (15,233) $ 11,707