Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2019	Aug. 31, 2019
Indefinite And Finite Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 113,736	$ 112,014
Gross Carrying Value	164,971	164,389
Net Book Value	51,235	52,375
Tradenames
Indefinite And Finite Lived Intangible Assets [Line Items]
Accumulated Amortization	0	0
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 21,071	20,420
Customer relationships
Indefinite And Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	14 years
Gross Carrying Value	$ 127,242	126,229
Accumulated Amortization	99,191	96,817
Net Book Value	$ 28,051	29,412
Patents
Indefinite And Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	12 years
Gross Carrying Value	$ 13,439	13,227
Accumulated Amortization	12,605	12,276
Net Book Value	$ 834	951
Trademarks and tradenames
Indefinite And Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	12 years
Gross Carrying Value	$ 3,219	4,513
Accumulated Amortization	1,940	2,921
Net Book Value	$ 1,279	$ 1,592