Goodwill and Other Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018	Aug. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 800	$ 800	$ 1,500	$ 1,700
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		$ 40,815
Finite-Lived Intangible Assets, Accumulated Amortization	(14,500)		(14,500)		(13,082)
Finite-Lived Intangible Assets, Net	26,315		26,315		27,733
Trademarks and other intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Carrying Amount	6,536		6,536		6,536
Finite-Lived Intangible Assets, Accumulated Amortization	(5,038)		(5,038)		(4,931)
Finite-Lived Intangible Assets, Net	1,498		1,498		1,605
Total intangible assets [Domain]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Carrying Amount	47,351		47,351		47,351
Finite-Lived Intangible Assets, Accumulated Amortization	(19,538)		(19,538)		(18,013)
Finite-Lived Intangible Assets, Net	$ 27,813		$ 27,813		$ 29,338