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Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2024 | Aug. 31, 2023 | Aug. 31, 2022
experience study |  |  |
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract] |  |  |
Actuarial (gain) loss | $ 0 | $ 0 |
Other demographic experience |  |  |
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract] |  |  |
Actuarial (gain) loss | 1,465 | (553) |
Other Benefits |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |
Service costs | 650 | 670 | $ 996
Expected return on assets | 0 | 0 | 0
Amortization of actuarial (gain) loss | (1,616) | (1,615) | (1,259)
Periodic benefit costs, net | $ (267) | $ (355) | $ (205)
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Discount rate | 5.33% | 4.64% | 2.57%
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract] |  |  |
Discount rate | 5.01% | 5.33% | 4.64%
Amortization of prior service (credit) costs | $ (445) | $ (445) | $ (445)
Other Benefits | interest cost |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |
Periodic benefit costs, net | 1,144 | 1,035 | 503
Qualified Pension Benefits | experience study |  |  |
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract] |  |  |
Actuarial (gain) loss | 2,988 | 2,573 |
Qualified Pension Benefits | Other demographic experience |  |  |
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract] |  |  |
Actuarial (gain) loss | 18,647 | 5,181 |
Qualified Pension Benefits | Pension Benefits |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |
Service costs | 37,391 | 38,579 | 46,275
Amortization of actuarial (gain) loss | 1,796 | 1,872 | 23,406
Periodic benefit costs, net | $ 27,433 | $ 28,059 | $ 43,064
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Discount rate | 5.38% | 4.69% | 2.80%
Expected return on plan assets | 5.64% | 4.88% | 4.88%
Rate of compensation increase | 4.98% | 4.93% | 4.79%
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract] |  |  |
Discount rate | 5.09% | 5.38% | 4.69%
Rate of compensation increase | 4.98% | 4.98% | 4.93%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate | 4.68% | 4.80% | 4.65%
Amortization of prior service (credit) costs | $ 178 | $ 149 | $ 174
Qualified Pension Benefits | Pension Benefits | interest cost |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |
Periodic benefit costs, net | 35,928 | 30,588 | 17,167
Qualified Pension Benefits | Pension Benefits | expected return on asset |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |
Periodic benefit costs, net | (47,860) | (43,129) | (43,958)
Nonqualified Pension Benefits | experience study |  |  |
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract] |  |  |
Actuarial (gain) loss | 244 | 159 |
Nonqualified Pension Benefits | Other demographic experience |  |  |
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract] |  |  |
Actuarial (gain) loss | 3,217 | 1,999 |
Nonqualified Pension Benefits | Pension Benefits |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |
Service costs | 1,968 | 1,840 | 926
Expected return on assets | 0 | 0 | 0
Amortization of actuarial (gain) loss | 380 | 245 | 478
Periodic benefit costs, net | $ 3,277 | $ 2,712 | $ 1,571
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Discount rate | 5.22% | 4.48% | 2.04%
Rate of compensation increase | 4.98% | 4.93% | 4.79%
Weighted-average assumptions to determine the net periodic benefit cost: [Abstract] |  |  |
Discount rate | 4.78% | 5.23% | 4.49%
Rate of compensation increase | 4.98% | 4.98% | 4.93%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate | 4.68% | 4.80% | 4.65%
Amortization of prior service (credit) costs | $ (114) | $ (114) | $ (114)
Nonqualified Pension Benefits | Pension Benefits | interest cost |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |
Periodic benefit costs, net | $ 1,043 | $ 741 | $ 281

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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