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Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2026 | May 31, 2025 | May 31, 2026 | May 31, 2025
Pension Benefits | Qualified |  |  |  |
Components of net periodic benefit costs: |  |  |  |
Service cost | $ 11,348 | $ 10,932 | $ 34,043 | $ 32,795
Interest cost | 9,027 | 8,725 | 27,080 | 26,174
Expected return on assets | (12,579) | (11,744) | (37,737) | (35,232)
Prior service (credit) cost amortization | (149) | 50 | (446) | 149
Actuarial loss (gain) amortization | 4,125 | 3,204 | 12,374 | 9,611
Net periodic benefit cost | 11,772 | 11,167 | 35,314 | 33,497
Pension Benefits | Nonqualified |  |  |  |
Components of net periodic benefit costs: |  |  |  |
Service cost | 831 | 757 | 2,494 | 2,270
Interest cost | 335 | 289 | 1,005 | 866
Expected return on assets | 0 | 0 | 0 | 0
Prior service (credit) cost amortization | (8) | (12) | (23) | (35)
Actuarial loss (gain) amortization | 246 | 200 | 737 | 599
Net periodic benefit cost | 1,404 | 1,234 | 4,213 | 3,700
Other Benefits |  |  |  |
Components of net periodic benefit costs: |  |  |  |
Service cost | 210 | 211 | 630 | 633
Interest cost | 281 | 285 | 844 | 855
Expected return on assets | 0 | 0 | 0 | 0
Prior service (credit) cost amortization | (111) | (111) | (334) | (334)
Actuarial loss (gain) amortization | (299) | (309) | (898) | (926)
Net periodic benefit cost | $ 81 | $ 76 | $ 242 | $ 228

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) 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)(5) -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)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + 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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