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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, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2013 | Aug. 31, 2012 | Aug. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues | $ 148,397 | $ 219,542 | $ 175,539 | $ 147,370 | $ 127,817 | $ 172,099 | $ 132,134 | $ 119,205 | $ 690,848 | $ 551,255 | $ 478,890
Operating Income (Loss) |  |  |  |  |  |  |  |  | 107,061 | 65,510 | 56,586
Unallocated general and administrative expenses |  |  |  |  |  |  |  |  | (43,441) | (38,198) | (33,659)
Interest and other income (expense), net |  |  |  |  |  |  |  |  | 246 | (402) | (72)
Total | 15,686 | 39,750 | 29,488 | 22,383 | 12,653 | 28,587 | 19,427 | 4,441 | 107,307 | 65,108 | 56,514
Capital Expenditures |  |  |  |  |  |  |  |  | 11,136 | 9,890 | 8,405
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,600 | 12,468 | 11,734
Assets | 512,296 |  |  |  | 415,531 |  |  |  | 512,296 | 415,531 | 381,144
Irrigation [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 625,996 | 475,299 | 369,930
Capital Expenditures |  |  |  |  |  |  |  |  | 10,687 | 7,942 | 5,490
Depreciation and amortization |  |  |  |  |  |  |  |  | 7,147 | 6,959 | 6,009
Assets | 391,527 |  |  |  | 303,741 |  |  |  | 391,527 | 303,741 | 267,275
Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 64,852 | 75,956 | 108,960
Capital Expenditures |  |  |  |  |  |  |  |  | 449 | 1,948 | 2,915
Depreciation and amortization |  |  |  |  |  |  |  |  | 5,453 | 5,509 | 5,725
Assets | 120,769 |  |  |  | 111,790 |  |  |  | 120,769 | 111,790 | 113,869
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 124,584 | 80,248 | 71,604
Operating Segments [Member] | Irrigation [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 125,395 | 80,259 | 59,703
Operating Segments [Member] | Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | (811) | (11) | 11,901
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unallocated general and administrative expenses |  |  |  |  |  |  |  |  | $ (17,523) | $ (14,738) | $ (15,018)

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- Definition Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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