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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, 2019
Nov. 30, 2018
Segment Reporting Information [Line Items]    
Total operating revenues $ 109,393 $ 111,951
Total operating income 12,276 2,040
Interest and other expense, net (1,021) (359)
Earnings before income taxes 11,255 1,681
Capital expenditures 4,322 5,701
Depreciation and amortization 4,748 3,424
Irrigation [Member]    
Segment Reporting Information [Line Items]    
Total operating revenues 82,352 87,610
Total operating income 9,757 7,783
Capital expenditures 3,042 2,137
Depreciation and amortization 3,104 2,332
Irrigation [Member] | North America [Member]    
Segment Reporting Information [Line Items]    
Total operating revenues 52,613 56,464
Irrigation [Member] | International [Member]    
Segment Reporting Information [Line Items]    
Total operating revenues 29,739 31,146
Infrastructure [Member]    
Segment Reporting Information [Line Items]    
Total operating revenues 27,041 24,341
Total operating income 8,768 4,168
Capital expenditures 1,112 190
Depreciation and amortization 919 965
Corporate Segment    
Segment Reporting Information [Line Items]    
Total operating income (6,249) (9,911)
Capital expenditures 168 3,374
Depreciation and amortization $ 725 $ 127