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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, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Change in plan assets: [Abstract] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 40,000 |  |
Pension Benefits |  |  |
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | 829,616 |  |
Fair value of plan assets at end of period | 909,427 | $ 829,616 |
Other Benefits |  |  |
Change in benefit obligation: |  |  |
Projected benefit obligation at beginning of period | 29,790 | 31,836 |
Service cost | 1,053 | 943 | $ 1,160
Interest cost | 1,094 | 908 | 930
Actuarial (gain) loss | (2,596) | (623) |
Assumption change | 3,398 | (1,612) |
Plan Amendments | 0 | 0 |
Settlements | 0 | 0 |
Benefits paid | (1,641) | (1,662) |
Projected benefit obligation at end of period | 31,098 | 29,790 | 31,836
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | 0 | 0 |
Actual gain (loss) on plan assets | 0 | 0 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 1,641 | 1,662 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | 0 | 0 |
Benefits Paid | (1,641) | (1,662) |
Fair value of plan assets at end of period | 0 | 0 | 0
Funded Status of Plan | (31,098) | (29,790) |
ASSETS |  |  |
Non-current assets | 0 | 0 |
Liabilities [Abstract] |  |  |
Current liabilities | (2,040) | (2,040) |
Non-current liabilities | (29,058) | (27,750) |
Ending balance | (31,098) | (29,790) |
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract] |  |  |
Prior service cost (credit) | (3,160) | (3,716) |
Net (gain) loss | (15,445) | (17,875) |
Ending balance | (18,605) | (21,591) |
Qualified Pension Benefits | Pension Benefits |  |  |
Change in benefit obligation: |  |  |
Projected benefit obligation at beginning of period | 767,184 | 806,174 |
Service cost | 38,592 | 39,677 | 42,149
Interest cost | 28,396 | 24,007 | 22,999
Actuarial (gain) loss | (9,606) | 3,146 |
Assumption change | 102,441 | (36,515) |
Plan Amendments | 18 | 244 |
Settlements | (615) | 0 |
Benefits paid | (49,714) | (69,549) |
Projected benefit obligation at end of period | 876,696 | 767,184 | 806,174
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | 829,616 | 875,820 |
Actual gain (loss) on plan assets | 90,139 | 23,345 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 40,001 | 0 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (615) | 0 |
Benefits Paid | (49,714) | (69,549) |
Fair value of plan assets at end of period | 909,427 | 829,616 | 875,820
Funded Status of Plan | 32,731 | 62,432 |
ASSETS |  |  |
Non-current assets | 32,731 | 62,432 |
Liabilities [Abstract] |  |  |
Current liabilities | 0 | 0 |
Non-current liabilities | 0 | 0 |
Ending balance | 32,731 | 62,432 |
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract] |  |  |
Prior service cost (credit) | 1,117 | 1,288 |
Net (gain) loss | 244,164 | 209,606 |
Ending balance | 245,281 | 210,894 |
Non-Qualified Pension Benefits | Pension Benefits |  |  |
Change in benefit obligation: |  |  |
Projected benefit obligation at beginning of period | 20,755 | 25,599 |
Service cost | 311 | 548 | 1,206
Interest cost | 747 | 711 | 843
Actuarial (gain) loss | 76 | 205 |
Assumption change | 1,841 | (783) |
Plan Amendments | 0 | 0 |
Settlements | (3,975) | (4,824) |
Benefits paid | (708) | (701) |
Projected benefit obligation at end of period | 19,047 | 20,755 | 25,599
Change in plan assets: [Abstract] |  |  |
Fair value of plan assets at beginning of period | 0 | 0 |
Actual gain (loss) on plan assets | 0 | 0 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 4,683 | 5,525 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (3,975) | (4,824) |
Benefits Paid | (708) | (701) |
Fair value of plan assets at end of period | 0 | 0 | $ 0
Funded Status of Plan | (19,047) | (20,755) |
ASSETS |  |  |
Non-current assets | 0 | 0 |
Liabilities [Abstract] |  |  |
Current liabilities | (1,580) | (1,780) |
Non-current liabilities | (17,467) | (18,975) |
Ending balance | (19,047) | (20,755) |
Amounts recognized in accumulated other comprehensive loss (pretax): [Abstract] |  |  |
Prior service cost (credit) | (616) | (691) |
Net (gain) loss | 2,151 | 427 |
Ending balance | $ 1,535 | $ (264) |

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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=118930883&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=118255775&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=118255775&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=118257860&loc=d3e4179-114921 + Details
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