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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues | $ 123,269 | $ 169,571 | $ 130,339 | $ 124,526 | $ 131,937 | $ 151,533 | $ 124,125 | $ 110,390 | $ 547,705 | $ 517,985 | $ 516,411
Total operating income |  |  |  |  |  |  |  |  | 38,563 | 40,201 | 34,375
Earnings before income taxes |  |  |  |  |  |  |  |  | 33,853 | 35,715 | 29,288
Capital expenditures |  |  |  |  |  |  |  |  | 11,054 | 8,863 | 11,496
Depreciation and amortization |  |  |  |  |  |  |  |  | 16,514 | 16,678 | 16,881
Total Assets | 500,256 |  |  |  | 506,032 |  |  |  | 500,256 | 506,032 | 487,515
Irrigation [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 9,259 | 6,313 | 8,375
Depreciation and amortization |  |  |  |  |  |  |  |  | 11,412 | 11,840 | 11,774
Total Assets | 277,712 |  |  |  | 337,446 |  |  |  | 277,712 | 337,446 | 332,294
Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 938 | 1,562 | 2,977
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,611 | 4,452 | 4,648
Total Assets | 69,919 |  |  |  | 80,187 |  |  |  | 69,919 | 80,187 | 81,160
Corporate Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | (27,227) | (22,704) | (33,392)
Capital expenditures |  |  |  |  |  |  |  |  | 857 | 988 | 144
Depreciation and amortization |  |  |  |  |  |  |  |  | 491 | 386 | 459
Total Assets | $ 152,625 |  |  |  | $ 88,399 |  |  |  | 152,625 | 88,399 | 74,061
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 547,705 | 517,985 | 516,411
Operating Segments [Member] | Irrigation [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 439,858 | 418,041 | 421,641
Total operating income |  |  |  |  |  |  |  |  | 41,933 | 42,774 | 49,232
Operating Segments [Member] | Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 107,847 | 99,944 | 94,770
Total operating income |  |  |  |  |  |  |  |  | 23,857 | 20,131 | 18,535
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and other income (expense), net |  |  |  |  |  |  |  |  | (4,710) | (4,486) | (5,087)
Earnings before income taxes |  |  |  |  |  |  |  |  | $ 33,853 | $ 35,715 | $ 29,288

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