Divestitures and Held-For-Sale (Narrative) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Nov. 30, 2018 USD ($)	Feb. 28, 2019 USD ($)	Feb. 28, 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		$ 67	$ 0
Note receivable from sale of business	$ 5,800	$ 5,823	$ 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	$ 100