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Industry Segment Information (Schedule of Segment Reporting Information Impacts on Balance Sheet, by Segment) (Details) - USD ($) $ in Thousands | Nov. 30, 2019 | Aug. 31, 2019 | Nov. 30, 2018
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 526,811 | $ 500,314 | $ 502,087
Irrigation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 305,928 | 292,202 | 289,773
Infrastructure [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 84,813 | 85,848 | 74,671
Corporate Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 136,070 | $ 122,264 | $ 137,643

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