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Divestitures and Held-For-Sale (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 29, 2020
USD ($)
Feb. 29, 2020
USD ($)
Feb. 28, 2019
USD ($)
Aug. 31, 2019
USD ($)
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   $ 0 $ 67    
Note receivable from sale of business   0 5,823    
Assets held-for-sale $ 0 0 2,744 $ 2,744  
Net proceeds from the sale of building 3,900 3,955 0    
Gain from the sale of building $ 1,200 $ 1,191 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