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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, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Pension Benefits |  |  |
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | $ 875,820 |  |
Fair value of plan assets at end of period | 829,616 | $ 875,820 |
Other Benefits |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of period | 31,836 | 36,779 |
Service cost | 943 | 1,160 | $ 1,412
Interest cost | 908 | 930 | 1,709
Actuarial (gain) loss | (623) | (4,650) |
Assumption change | (1,612) | (775) |
Plan Amendments | 0 | 0 |
Settlements | 0 | 0 |
Benefits paid | (1,662) | (1,608) |
Benefit obligation at end of period | 29,790 | 31,836 | 36,779
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | 0 | 0 |
Actual gain (loss) on plan assets | 0 | 0 |
Company contributions | 1,662 | 1,608 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | 0 | 0 |
Benefits Paid | (1,662) | (1,608) |
Fair value of plan assets at end of period | 0 | 0 | 0
Funded Status of Plan | (29,790) | (31,836) |
ASSETS |  |  |
Non-current assets | 0 | 0 |
Liabilities [Abstract] |  |  |
Current liabilities | (2,040) | (2,140) |
Non-current liabilities | (27,750) | (29,696) |
Ending balance | (29,790) | (31,836) |
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract] |  |  |
Prior service cost (credit) | (3,716) | (4,281) |
Net (gain) loss | (17,875) | (16,864) |
Ending balance | (21,591) | (21,145) |
Qualified Pension Benefits | Pension Benefits |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of period | 806,174 | 812,749 |
Service cost | 39,677 | 42,149 | 37,533
Interest cost | 24,007 | 22,999 | 30,773
Actuarial (gain) loss | 3,146 | (10,054) |
Assumption change | (36,515) | (17,750) |
Plan Amendments | 244 | 0 |
Settlements | 0 | 0 |
Benefits paid | (69,549) | (43,919) |
Benefit obligation at end of period | 767,184 | 806,174 | 812,749
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | 875,820 | 883,265 |
Actual gain (loss) on plan assets | 23,345 | 36,474 |
Company contributions | 0 | 0 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | 0 | 0 |
Benefits Paid | (69,549) | (43,919) |
Fair value of plan assets at end of period | 829,616 | 875,820 | 883,265
Funded Status of Plan | 62,432 | 69,646 |
ASSETS |  |  |
Non-current assets | 62,432 | 70,019 |
Liabilities [Abstract] |  |  |
Current liabilities | 0 | 0 |
Non-current liabilities | 0 | (373) |
Ending balance | 62,432 | 69,646 |
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract] |  |  |
Prior service cost (credit) | 1,288 | 2,481 |
Net (gain) loss | 209,606 | 236,232 |
Ending balance | 210,894 | 238,713 |
Non-Qualified Pension Benefits | Pension Benefits |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of period | 25,599 | 32,696 |
Service cost | 548 | 1,206 | 1,035
Interest cost | 711 | 843 | 1,406
Actuarial (gain) loss | 205 | (5,692) |
Assumption change | (783) | (655) |
Plan Amendments | 0 | 0 |
Settlements | 4,824 | (2,131) |
Benefits paid | (701) | (668) |
Benefit obligation at end of period | 20,755 | 25,599 | 32,696
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | 0 | 0 |
Actual gain (loss) on plan assets | 0 | 0 |
Company contributions | 5,525 | 2,799 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (4,824) | (2,131) |
Benefits Paid | (701) | (668) |
Fair value of plan assets at end of period | 0 | 0 | $ 0
Funded Status of Plan | (20,755) | (25,599) |
ASSETS |  |  |
Non-current assets | 0 | 0 |
Liabilities [Abstract] |  |  |
Current liabilities | (1,780) | (2,270) |
Non-current liabilities | (18,975) | (23,329) |
Ending balance | (20,755) | (25,599) |
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract] |  |  |
Prior service cost (credit) | (691) | (660) |
Net (gain) loss | 427 | 953 |
Ending balance | $ (264) | $ 293 |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: 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=112275985&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: 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=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: 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=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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