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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2021 | May 31, 2020 | May 31, 2021 | May 31, 2020
Qualified Pension Benefits |  |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |  |
Service cost | $ 11,307 | $ 10,538 | $ 33,921 | $ 31,613
Interest cost | 4,141 | 5,431 | 12,422 | 16,292
Expected return on assets | (10,910) | (11,671) | (32,731) | (35,013)
Prior service cost (credit) amortization | 45 | 45 | 134 | 134
Actuarial loss (gain) amortization | 5,447 | 5,396 | 16,342 | 16,187
Net periodic benefit cost (benefit) | 10,030 | 9,739 | 30,088 | 29,213
Non-Qualified Pension Benefits |  |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |  |
Service cost | 108 | 101 | 325 | 304
Interest cost | 68 | 107 | 205 | 322
Expected return on assets | 0 | 0 | 0 | 0
Prior service cost (credit) amortization | (28) | (28) | (85) | (85)
Actuarial loss (gain) amortization | 53 | 25 | 159 | 74
Net periodic benefit cost (benefit) | 201 | 205 | 604 | 615
Other Benefits |  |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |  |
Service cost | 297 | 262 | 890 | 787
Interest cost | 123 | 187 | 369 | 560
Expected return on assets | 0 | 0 | 0 | 0
Prior service cost (credit) amortization | (111) | (111) | (334) | (334)
Actuarial loss (gain) amortization | (341) | (348) | (1,024) | (1,044)
Net periodic benefit cost (benefit) | $ (32) | $ (10) | $ (99) | $ (31)

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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