Goodwill and Other Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018	Aug. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 1,900	$ 800	$ 3,400	$ 2,500
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	84,815		$ 84,815		$ 40,815
Finite-Lived Intangible Assets, Accumulated Amortization	(16,054)		(16,054)		(13,082)
Finite-Lived Intangible Assets, Net	68,761		68,761		27,733
Trademarks and other intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Carrying Amount	9,736		9,736		6,536
Finite-Lived Intangible Assets, Accumulated Amortization	(5,393)		(5,393)		(4,931)
Finite-Lived Intangible Assets, Net	4,343		4,343		1,605
Total intangible assets [Domain]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Carrying Amount	94,551		94,551		47,351
Finite-Lived Intangible Assets, Accumulated Amortization	(21,447)		(21,447)		(18,013)
Finite-Lived Intangible Assets, Net	$ 73,104		$ 73,104		$ 29,338