Goodwill and Other Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017	Aug. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 800	$ 1,000	$ 1,700	$ 2,300
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	(11,565)		(11,565)		(14,695)
Finite-Lived Intangible Assets, Net	29,512		29,512		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	(4,811)		(4,811)		(21,778)
Finite-Lived Intangible Assets, Net	1,725		1,725		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	(16,376)		(16,376)		(36,473)
Finite-Lived Intangible Assets, Net	$ 31,237		$ 31,237		$ 33,330