Goodwill and Other Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017	Aug. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 800	$ 1,000	$ 2,500	$ 3,300
Other Intangible Assets [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			2 years
Other Intangible Assets [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			30 years
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Carrying Amount	41,077		$ 41,077		$ 46,180
Finite-Lived Intangible Assets, Accumulated Amortization	(12,328)		(12,328)		(14,695)
Finite-Lived Intangible Assets, Net	28,749		28,749		31,485
Trademarks and other intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Carrying Amount	6,536		6,536		23,623
Finite-Lived Intangible Assets, Accumulated Amortization	(4,871)		(4,871)		(21,778)
Finite-Lived Intangible Assets, Net	1,665		1,665		1,845
Total intangible assets [Domain]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Carrying Amount	47,613		47,613		69,803
Finite-Lived Intangible Assets, Accumulated Amortization	(17,199)		(17,199)		(36,473)
Finite-Lived Intangible Assets, Net	$ 30,414		$ 30,414		$ 33,330