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Fair Value (Reconciliation of Commodity Derivative Recognized in Other Comprehensive Income) (Details) - Commodity - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2024
Nov. 30, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 38,029 $ 194,425
Unrealized holding gain before reclassification (1,691) (47,277)
Reclassification for gain included in net earnings (3,035) (2,791)
Ending balance $ 33,303 $ 144,357