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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)

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