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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, 2024 | Aug. 31, 2023 | Aug. 31, 2022
Pension Benefits | Qualified Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Prior service cost | $ 223 | $ 490 | $ 132
Net actuarial loss (gain) | 23,309 | 14,082 | 59,020
Amortization of actuarial (gain) loss | (1,796) | (1,872) | (23,406)
Amortization of prior service (credit) costs | (178) | (149) | (174)
Settlement of retiree obligations | 0 | 0 | 0
Total recognized in other comprehensive loss (income) | 21,558 | 12,551 | 35,572
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) | 4,087 | 1,282 | (1,537)
Amortization of actuarial (gain) loss | (380) | (245) | (478)
Amortization of prior service (credit) costs | 114 | 114 | 114
Settlement of retiree obligations | 0 | 0 | (307)
Total recognized in other comprehensive loss (income) | 3,821 | 1,151 | (2,208)
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) | 2,145 | (1,865) | (4,243)
Amortization of actuarial (gain) loss | 1,616 | 1,615 | 1,259
Amortization of prior service (credit) costs | 445 | 445 | 445
Settlement of retiree obligations | 0 | 0 | 0
Total recognized in other comprehensive loss (income) | $ 4,206 | $ 195 | $ (2,539)

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- Definition Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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