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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, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Cost of goods sold        
Derivative [Line Items]        
Pretax gains (losses) reclassified from AOCI related to cash flow hedges $ 6,102 $ 0 $ 8,002 $ 0
Cash Flow Hedging        
Derivative [Line Items]        
Pretax gains (losses) recorded in OCI related to cash flow hedges $ 14,170 $ 0 $ 11,707 $ 0