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Postretirement and Other Employee Benefits (Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 6,078	$ 4,463
Interest cost	1,121	763
Expected long-term return on plan assets	(3,870)	(2,786)
Recognized actuarial (gain) loss	(1,243)	223
Amortization of actuarial gain	(1,724)	0
Amortization of prior service credit	(13)	(11)
Net periodic benefit cost	$ 349	$ 2,652

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