Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2018	Aug. 31, 2018
Indefinite And Finite Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 151,964	$ 193,941
Gross Carrying Value	304,683	374,978
Net Book Value	152,719	181,037
Tradenames
Indefinite And Finite Lived Intangible Assets [Line Items]
Accumulated Amortization	0	0
Net Book Value	83,531	87,253
Gross Carrying Value	$ 83,531	87,253
Customer relationships
Indefinite And Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	15 years
Gross Carrying Value	$ 188,316	230,601
Accumulated Amortization	123,129	147,451
Net Book Value	$ 65,187	83,150
Patents
Indefinite And Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	11 years
Gross Carrying Value	$ 20,831	30,355
Accumulated Amortization	18,757	25,327
Net Book Value	$ 2,074	5,028
Trademarks and tradenames
Indefinite And Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	15 years
Gross Carrying Value	$ 6,862	20,823
Accumulated Amortization	5,008	15,347
Net Book Value	$ 1,854	5,476
Other intangibles
Indefinite And Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	3 years
Gross Carrying Value	$ 5,143	5,946
Accumulated Amortization	5,070	5,816
Net Book Value	$ 73	$ 130