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Benefit Plans - Schedule of the Effect a Percentage Point Change in the Assumed Health Care Cost Trend Rates (Details) $ in Thousands | 12 Months Ended
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Aug. 31, 2018 USD ($)
Retirement Benefits [Abstract] |
Effect on total of service and interest cost components (1% increase) | $ 230
Effect on total of service and interest cost components (1% decrease) | (200)
Effect on postretirement benefit obligation (1% increase) | 2,400
Effect on postretirement benefit obligation (1% decrease) | $ (2,100)

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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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