Goodwill and Other Intangibles - Segments (Details) $ in Thousands	6 Months Ended
Feb. 28, 2017 USD ($) segment
Changes in the carrying value of goodwill
Balance at the beginning of the period	$ 43,576
Acquisition of Resin Designs, LLC	7,592
Foreign currency translation adjustment	(240)
Balance at the end of the period	$ 50,928
Number of reportable segments \| segment	11
Number of operating segments \| segment	2
Construction Materials
Changes in the carrying value of goodwill
Balance at the beginning of the period	$ 10,696
Foreign currency translation adjustment	(10)
Balance at the end of the period	10,686
Industrial Materials
Changes in the carrying value of goodwill
Balance at the beginning of the period	32,880
Acquisition of Resin Designs, LLC	7,592
Foreign currency translation adjustment	(230)
Balance at the end of the period	$ 40,242

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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