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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment)(Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2011 | May 31, 2011 | Feb. 28, 2011 | Nov. 30, 2010 | Aug. 31, 2012 | Aug. 31, 2011 | Aug. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues | $ 127,817 | $ 172,099 | $ 132,134 | $ 119,205 | $ 116,110 | $ 153,446 | $ 120,168 | $ 89,166 | $ 551,255 | $ 478,890 | $ 358,440
Operating Income (Loss) |  |  |  |  |  |  |  |  | 65,510 | 56,586 | 37,842
Segment operating income |  |  |  |  |  |  |  |  | 80,248 | 71,604 | 51,952
Unallocated general and administrative expenses |  |  |  |  |  |  |  |  | (14,738) | (15,018) | (14,110)
Interest and other income (expense), net |  |  |  |  |  |  |  |  | (402) | (72) | (1,060)
Total | 12,653 | 28,587 | 19,427 | 4,441 | 9,777 | 23,159 | 17,001 | 6,577 | 65,108 | 56,514 | 36,782
Capital Expenditures |  |  |  |  |  |  |  |  | 9,890 | 8,405 | 5,784
Depreciation and Amortization |  |  |  |  |  |  |  |  | 12,468 | 11,734 | 10,710
Assets | 415,531 |  |  |  | 381,144 |  |  |  | 415,531 | 381,144 | 325,481
Irrigation [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 475,299 | 369,930 | 258,666
Operating Income (Loss) |  |  |  |  |  |  |  |  | 80,259 | 59,703 | 40,869
Capital Expenditures |  |  |  |  |  |  |  |  | 7,942 | 5,490 | 3,125
Depreciation and Amortization |  |  |  |  |  |  |  |  | 6,959 | 6,009 | 4,597
Assets | 303,741 |  |  |  | 267,275 |  |  |  | 303,741 | 267,275 | 206,885
Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 75,956 | 108,960 | 99,774
Operating Income (Loss) |  |  |  |  |  |  |  |  | (11) | 11,901 | 11,083
Capital Expenditures |  |  |  |  |  |  |  |  | 1,948 | 2,915 | 2,659
Depreciation and Amortization |  |  |  |  |  |  |  |  | 5,509 | 5,725 | 6,113
Assets | $ 111,790 |  |  |  | $ 113,869 |  |  |  | $ 111,790 | $ 113,869 | $ 118,596

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