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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017
Qualified Pension Benefits |  |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |  |
Service cost | $ 9,920,000 | $ 11,692,000 | $ 19,839,000 | $ 21,075,000
Interest cost | 5,991,000 | 3,812,000 | 11,992,000 | 11,504,000
Expected return on assets | (12,049,000) | (12,101,000) | (24,089,000) | (24,115,000)
Prior service cost (credit) amortization | 360,000 | 368,000 | 719,000 | 770,000
Actuarial (gain) loss amortization | 4,511,000 | 6,650,000 | 11,399,000 | 11,415,000
Net periodic benefit cost | 8,733,000 | 10,421,000 | 19,860,000 | 20,649,000
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 0 |
Non-Qualified Pension Benefits |  |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |  |
Service cost | 137,000 | 344,000 | 274,000 | 603,000
Interest cost | 178,000 | 70,000 | 356,000 | 422,000
Expected return on assets | 0 | 0 | 0 | 0
Prior service cost (credit) amortization | 7,000 | (47,000) | 15,000 | 10,000
Actuarial (gain) loss amortization | 16,000 | 100,000 | 30,000 | 273,000
Net periodic benefit cost | 338,000 | 467,000 | 675,000 | 1,308,000
Other Benefits |  |  |  |
Component of net periodic benefit costs: [Abstract] |  |  |  |
Service cost | 236,000 | 227,000 | 472,000 | 580,000
Interest cost | 227,000 | 39,000 | 454,000 | 466,000
Expected return on assets | 0 | 0 | 0 | 0
Prior service cost (credit) amortization | (142,000) | (253,000) | (283,000) | (283,000)
Actuarial (gain) loss amortization | (306,000) | (283,000) | (612,000) | (399,000)
Net periodic benefit cost | $ 15,000 | $ (270,000) | $ 31,000 | $ 364,000

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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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