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Employee and Retiree Benefits (Postretirement Narrative) (Details)	12 Months Ended
	Aug. 31, 2019
Retirement Benefits [Abstract]
Postretirement health care benefits age requirement before distribution occurs	55 years
Postretirement health care benefits continuous service requirement	15 years

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Defined Benefit Plan, Age Requirement Before Distribution Occurs

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Defined Benefit Plan, Service Requirement

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