Derivative Financial Instruments and Hedging Activities - Commodity Derivatives (Details) - Commodity derivatives - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020
Cost of goods sold
Derivative [Line Items]
Pretax gains (losses) reclassified from AOCI related to cash flow hedges	$ 2,329	$ 884	$ 19,084	$ 7,862
Cash Flow Hedging
Derivative [Line Items]
Pretax gains (losses) recorded in OCI related to cash flow hedges	$ (7,590)	$ 11,081	$ (7,700)	$ (4,153)