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Divestitures and Held-For-Sale (Narrative) (Details) $ in Thousands	9 Months Ended
	May 31, 2019 USD ($)	May 31, 2018 USD ($)	Aug. 31, 2018 Facility
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss on sale of irrigation dealership	$ 301	$ 6,023
Note receivable from sale of business	5,589	$ 0
North America [Member] | Infrastructure [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of manufacturing facilities closed | Facility			1
General and Administrative Expense [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss on sale of irrigation dealership	$ 300

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