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, 2026 |
May 31, 2025 |
May 31, 2026 |
May 31, 2025 |
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||||
| Beginning balance | $ 56,181 | $ 55,358 | $ 53,443 | $ 38,029 |
| Unrealized holding gain before reclassification | (4,612) | 13,252 | 6,376 | 37,043 |
| Reclassification for gain included in net earnings | (1,473) | (1,622) | (9,723) | (8,084) |
| Ending balance | $ 50,096 | $ 66,988 | $ 50,096 | $ 66,988 |