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Postretirement and Other Employee Benefits (Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Retirement Benefits [Abstract]
Service cost	$ 1,063	$ 1,068	$ 883
Interest cost	3,807	2,942	4,844
Expected long-term return on plan assets	(5,954)	(4,206)	(5,560)
Recognized actuarial loss	1,127	1,929	1,046
Amortization of prior service credit	(88)	(138)	(139)
Net settlement loss	116	1,472	0
Net periodic benefit cost	$ 71	$ 3,067	$ 1,074

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