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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2018 | May 31, 2017 | May 31, 2018 | May 31, 2017
Qualified Pension Benefits |  |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |  |
Service cost | $ 9,920,000 | $ 10,537,000 | $ 29,758,000 | $ 31,612,000
Interest cost | 5,997,000 | 5,753,000 | 17,988,000 | 17,257,000
Expected return on assets | (12,044,000) | (12,058,000) | (36,133,000) | (36,173,000)
Prior service cost (credit) amortization | 360,000 | 385,000 | 1,078,000 | 1,155,000
Actuarial (gain) loss amortization | 4,905,000 | 5,708,000 | 16,304,000 | 17,123,000
Net periodic benefit cost | 9,138,000 | 10,325,000 | 28,995,000 | 30,974,000
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 0 |
Non-Qualified Pension Benefits |  |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |  |
Service cost | 137,000 | 302,000 | 411,000 | 905,000
Interest cost | 177,000 | 210,000 | 533,000 | 632,000
Expected return on assets | 0 | 0 | 0 | 0
Prior service cost (credit) amortization | 7,000 | 4,000 | 23,000 | 14,000
Actuarial (gain) loss amortization | 16,000 | 136,000 | 46,000 | 409,000
Net periodic benefit cost | 337,000 | 652,000 | 1,013,000 | 1,960,000
Other Benefits |  |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |  |
Service cost | 236,000 | 290,000 | 707,000 | 870,000
Interest cost | 227,000 | 232,000 | 681,000 | 698,000
Expected return on assets | 0 | 0 | 0 | 0
Prior service cost (credit) amortization | (142,000) | (141,000) | (424,000) | (424,000)
Actuarial (gain) loss amortization | (306,000) | (199,000) | (918,000) | (598,000)
Net periodic benefit cost | $ 15,000 | $ 182,000 | $ 46,000 | $ 546,000

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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