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Benefit Plans - Financial Information on Changes in Benefit Obligation, Plan Assets Funded and Balance Sheets Status (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2023 | Aug. 31, 2022 | Aug. 31, 2021
Change in plan assets: [Abstract] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 40,000 |  |
Fair value of plan assets at end of period | 736,150 |  |
Pension Benefits |  |  |
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | 787,422 |  |
Fair value of plan assets at end of period |  | $ 787,422 |
Other Benefits |  |  |
Change in benefit obligation: |  |  |
Projected benefit obligation at beginning of period | 24,524 | 29,069 |
Service cost | 670 | 996 | $ 1,186
Assumption change | (1,312) | (4,979) |
Plan Amendments | 0 | 0 |
Settlements | 0 | 0 |
Benefits paid | (1,792) | (1,801) |
Projected benefit obligation at end of period | 22,572 | 24,524 | 29,069
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | 0 | 0 |
Actual gain (loss) on plan assets | 0 | 0 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 1,792 | 1,801 |
Benefits Paid | (1,792) | (1,801) |
Fair value of plan assets at end of period | 0 | 0 | 0
Funded Status of Plan | (22,572) | (24,524) |
ASSETS |  |  |
Non-current assets | 0 | 0 |
Liabilities [Abstract] |  |  |
Current liabilities | (2,170) | (2,290) |
Non-current liabilities | (20,402) | (22,234) |
Ending balance | (22,572) | (24,524) |
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract] |  |  |
Prior service cost (credit) | (1,380) | (1,825) |
Net (gain) loss | (18,096) | (17,846) |
Ending balance | (19,476) | (19,671) |
Qualified Pension Benefits | Pension Benefits |  |  |
Change in benefit obligation: |  |  |
Projected benefit obligation at beginning of period | 759,173 | 925,239 |
Service cost | 38,579 | 46,275 | 45,229
Assumption change | (45,216) | (164,543) |
Plan Amendments | 490 | 132 |
Settlements | 0 | 0 |
Benefits paid | (82,857) | (77,913) |
Projected benefit obligation at end of period | 708,511 | 759,173 | 925,239
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | 787,422 | 993,124 |
Actual gain (loss) on plan assets | (8,415) | (166,789) |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 40,000 | 39,000 |
Benefits Paid | (82,857) | (77,913) |
Fair value of plan assets at end of period | 736,150 | 787,422 | 993,124
Funded Status of Plan | 27,639 | 28,249 |
ASSETS |  |  |
Non-current assets | 27,639 | 28,249 |
Liabilities [Abstract] |  |  |
Current liabilities | 0 | 0 |
Non-current liabilities | 0 | 0 |
Ending balance | 27,639 | 28,249 |
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract] |  |  |
Prior service cost (credit) | 1,172 | 831 |
Net (gain) loss | 247,609 | 235,399 |
Ending balance | 248,781 | 236,230 |
Nonqualified Pension Benefits | Pension Benefits |  |  |
Change in benefit obligation: |  |  |
Projected benefit obligation at beginning of period | 18,257 | 20,604 |
Service cost | 1,840 | 926 | 433
Assumption change | (876) | (2,892) |
Plan Amendments | 0 | 0 |
Settlements | 0 | (1,327) |
Benefits paid | (1,140) | (691) |
Projected benefit obligation at end of period | 20,980 | 18,257 | 20,604
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | 0 | 0 |
Actual gain (loss) on plan assets | 0 | 0 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 1,140 | 2,018 |
Benefits Paid | (1,140) | (2,018) |
Fair value of plan assets at end of period | 0 | 0 | $ 0
Funded Status of Plan | (20,980) | (18,257) |
ASSETS |  |  |
Non-current assets | 0 | 0 |
Liabilities [Abstract] |  |  |
Current liabilities | (2,880) | (2,300) |
Non-current liabilities | (18,100) | (15,957) |
Ending balance | (20,980) | (18,257) |
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract] |  |  |
Prior service cost (credit) | (160) | (274) |
Net (gain) loss | 4,294 | 3,257 |
Ending balance | $ 4,134 | $ 2,983 |

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for 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 -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for 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 -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -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 1 -Subparagraph (d)(iv)(01) -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 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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