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Postretirement and Other Employee Benefits (Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Retirement Benefits [Abstract]
Service cost	$ 6,638	$ 289	$ 11,101	$ 584
Interest cost	809	870	1,572	1,755
Expected long-term return on plan assets	(3,789)	(1,330)	(6,575)	(2,682)
Recognized actuarial loss	226	205	449	413
Amortization of prior service credit	(11)	(11)	(22)	(23)
Net periodic benefit cost	$ 3,873	$ 23	$ 6,525	$ 47

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