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Benefit Plans - Components of Net Periodic Benefit Costa and Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2023 | Aug. 31, 2022 | Aug. 31, 2021
Pension Benefits | Qualified Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Prior service cost | $ 490 | $ 132 | $ 113
Net actuarial loss (gain) | 14,082 | 59,020 | (4,408)
Amortization of actuarial (gain) loss | (1,872) | (23,406) | (21,790)
Amortization of prior service (credit) costs | (149) | (174) | (178)
Settlement of retiree obligations | 0 | 0 | 0
Total recognized in other comprehensive loss (income) | 12,551 | 35,572 | (26,263)
Pension Benefits | Nonqualified Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Prior service cost | 0 | 0 | 0
Net actuarial loss (gain) | 1,282 | (1,537) | 1,978
Amortization of actuarial (gain) loss | (245) | (478) | (212)
Amortization of prior service (credit) costs | 114 | 114 | 114
Settlement of retiree obligations | 0 | (307) | 0
Total recognized in other comprehensive loss (income) | 1,151 | (2,208) | 1,880
Other Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Prior service cost | 0 | 0 | 0
Net actuarial loss (gain) | (1,865) | (4,243) | (1,163)
Amortization of actuarial (gain) loss | 1,615 | 1,259 | 1,365
Amortization of prior service (credit) costs | 445 | 445 | 445
Settlement of retiree obligations | 0 | 0 | 0
Total recognized in other comprehensive loss (income) | $ 195 | $ (2,539) | $ 647

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