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Postretirement and Other Employee Benefits (Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($) $ in Thousands	Aug. 31, 2019	Aug. 31, 2018
Retirement Benefits [Abstract]
Projected benefit obligation	$ 174,690	$ 161,104
Accumulated benefit obligation	161,729	152,380
Fair value of plan assets	$ 158,101	$ 151,715

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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