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Summary of Significant Accounting Policies - Acquisition (Details) $ / shares in Units, $ in Thousands							1 Months Ended			3 Months Ended				12 Months Ended
	Nov. 01, 2017 $ / shares	Apr. 03, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 23, 2016 USD ($)	Jan. 30, 2015 USD ($) item	Oct. 31, 2014	Jun. 30, 2016 USD ($)	Nov. 30, 2015 USD ($)	Jun. 30, 2012	May 31, 2017 USD ($)	Nov. 30, 2016 USD ($)	May 31, 2016 USD ($)	Nov. 30, 2015 USD ($)	Aug. 31, 2017 USD ($) $ / shares	Aug. 31, 2016 USD ($) $ / shares	Aug. 31, 2015 USD ($) $ / shares
Basis of Presentation
Minimum percentage of ownership interest in investments in unconsolidated entities under the equity method														20.00%
Add: net gain attributable to non-controlling interest																$ (95)
Annual cash dividends declared per share \| $ / shares														$ 0.70	$ 0.65	$ 0.60
Sale
Net proceeds from sale of businesses														$ 3,915	$ 1,729	$ 739
Subsequent events
Basis of Presentation
Annual cash dividends declared per share \| $ / shares	$ 0.80
Resin Designs
Basis of Presentation
Purchase price			$ 30,270
Acquisition
Contingent purchase price paid for acquisition			$ 30,270
Acquisition related expenses											$ 584
NEPTCO
Basis of Presentation
Percentage of ownership stake acquired						50.00%			50.00%
Percentage of net assets and net loss of the JV recorded within the Company's consolidated financial statements									50.00%
Percentage of ownership stake and pro rata share in net result of the JV									50.00%
Add: net gain attributable to non-controlling interest																$ (95)
Henkel Corporation ( Seller)
Basis of Presentation
Purchase price					$ 33,285
Number of product lines acquired \| item					2
Lease term					10 years
Period to perform certain manufacturing and application services					3 years
Spray Products Private Limited
Basis of Presentation
Purchase price				$ 1,161			$ 1,161
Fiber Optic Cable Components Product Line
Sale
Net proceeds from sale of businesses		$ 3,858								$ 3,458
Gain on assets sold		$ 2,013
RodPack Business
Sale
Net proceeds from sale of businesses								$ 2,186				$ 229	$ 1,500