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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 9 Months Ended
May 31, 2024
May 31, 2023
May 31, 2024
May 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 86,317 $ 280,842 $ 194,425 $ 143,500
Unrealized holding gain before reclassification (35,907) 1,526 (139,665) 145,808
Reclassification for gain included in net earnings (1,298) (2,083) (5,648) (9,023)
Ending balance $ 49,112 $ 280,285 $ 49,112 $ 280,285