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Industry Segment Information (Schedule of Segment Reporting Information Impacts on Statement of Operations, by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Segment Reporting Information [Line Items]    
Total operating revenues $ 108,485 $ 109,393
Total operating income 7,535 12,276
Interest and other expense, net (652) (1,021)
Earnings before income taxes 6,883 11,255
Irrigation [Member]    
Segment Reporting Information [Line Items]    
Total operating revenues 87,356 83,327
Total operating income 10,633 9,784
Irrigation [Member] | North America [Member]    
Segment Reporting Information [Line Items]    
Total operating revenues 52,790 53,588
Irrigation [Member] | International [Member]    
Segment Reporting Information [Line Items]    
Total operating revenues 34,566 29,739
Infrastructure [Member]    
Segment Reporting Information [Line Items]    
Total operating revenues 21,129 26,066
Total operating income 4,256 8,741
Corporate Segment    
Segment Reporting Information [Line Items]    
Total operating income $ (7,354) $ (6,249)