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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, 2025
May 31, 2024
May 31, 2025
May 31, 2024
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 55,358 $ 86,317 $ 38,029 $ 194,425
Unrealized holding gain before reclassification 13,252 (35,907) 37,043 (139,665)
Reclassification for gain included in net earnings (1,622) (1,298) (8,084) (5,648)
Ending balance $ 66,988 $ 49,112 $ 66,988 $ 49,112