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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, 2020 | May 31, 2019 | May 31, 2020 | May 31, 2019
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | $ 123,106 | $ 121,054 | $ 346,287 | $ 342,187
Total operating income | 15,828 | 4,475 | 36,746 | 2,055
Interest and other expense, net | (3,563) | (1,246) | (6,359) | (2,213)
Earnings (loss) before income taxes | 12,265 | 3,229 | 30,387 | (158)
Irrigation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 93,523 | 98,618 | 267,948 | 281,994
Total operating income | 15,014 | 11,037 | 34,385 | 26,341
Irrigation [Member] | North America [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 60,917 | 62,974 | 179,197 | 177,118
Irrigation [Member] | International [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 32,606 | 35,644 | 88,751 | 104,876
Infrastructure [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 29,583 | 22,436 | 78,339 | 60,193
Total operating income | 8,560 | 3,537 | 23,686 | 7,259
Corporate Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating income | $ (7,746) | $ (10,099) | $ (21,325) | $ (31,545)

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