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Postretirement and Other Employee Benefits (Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Retirement Benefits [Abstract]
Service cost	$ 1,437	$ 1,063	$ 1,068
Interest cost	3,715	3,807	2,942
Expected long-term return on plan assets	(5,291)	(5,954)	(4,206)
Recognized actuarial loss	741	1,127	1,929
Amortization of prior service credit	(44)	(88)	(138)
Net settlement loss	634	116	1,472
Net periodic benefit cost	$ 1,192	$ 71	$ 3,067

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