Goodwill and Other Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Aug. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 800	$ 900
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	$ 40,815		$ 40,815
Finite-Lived Intangible Assets, Accumulated Amortization	(13,791)		(13,082)
Finite-Lived Intangible Assets, Net	27,024		27,733
Trademarks and other intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Carrying Amount	6,536		6,536
Finite-Lived Intangible Assets, Accumulated Amortization	(4,990)		(4,931)
Finite-Lived Intangible Assets, Net	1,546		1,605
Total intangible assets [Domain]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Carrying Amount	47,351		47,351
Finite-Lived Intangible Assets, Accumulated Amortization	(18,781)		(18,013)
Finite-Lived Intangible Assets, Net	$ 28,570		$ 29,338