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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 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Segment Reporting Information [Line Items]        
Total operating revenues $ 161,936 $ 123,106 $ 413,998 $ 346,287
Total operating income 21,341 15,828 44,684 36,746
Interest and other expense, net (187) (3,563) (2,087) (6,359)
Earnings before income taxes 21,154 12,265 42,597 30,387
Irrigation [Member]        
Segment Reporting Information [Line Items]        
Total operating revenues 140,175 95,501 346,104 272,321
Total operating income 23,925 15,417 52,603 35,282
Irrigation [Member] | North America [Member]        
Segment Reporting Information [Line Items]        
Total operating revenues 87,364 62,895 220,332 183,570
Irrigation [Member] | International [Member]        
Segment Reporting Information [Line Items]        
Total operating revenues 52,811 32,606 125,772 88,751
Infrastructure [Member]        
Segment Reporting Information [Line Items]        
Total operating revenues 21,761 27,605 67,894 73,966
Total operating income 3,767 8,157 14,364 22,788
Corporate Segment        
Segment Reporting Information [Line Items]        
Total operating income $ (6,351) $ (7,746) $ (22,283) $ (21,324)