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Industry Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
May 31, 2012 | Nov. 30, 2011 | May 31, 2011 | May 31, 2012 | May 31, 2011 | Aug. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total operating revenues | $ 172,099 |  | $ 153,446 | $ 423,438 | $ 362,780 |
Segment operating income | 32,675 |  | 26,665 | 63,347 | 56,857 |
Unallocated general and administrative expenses | (3,888) |  | (3,524) | (10,529) | (10,045) |
Interest and other income (expense), net | (200) |  | 18 | (363) | (75) |
Earnings before income taxes | 28,587 |  | 23,159 | 52,455 | 46,737 |
Capital Expenditures | 2,850 |  | 913 | 7,573 | 5,315 |
Depreciation and Amortization | 3,149 |  | 2,940 | 9,384 | 8,820 |
Assets | 416,948 |  | 377,806 | 416,948 | 377,806 | 381,144
Environmental remediation expenses |  | 7,200 | 462 | 7,225 | 1,175 |
Irrigation [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 149,624 |  | 126,903 | 367,388 | 278,570 |
Segment operating income | 31,242 |  | 25,584 | 64,046 | 47,490 |
Capital Expenditures | 2,662 |  | 751 | 6,493 | 2,789 |
Depreciation and Amortization | 1,710 |  | 1,329 | 5,055 | 4,069 |
Assets | 304,515 |  | 268,283 | 304,515 | 268,283 | 267,275
Environmental remediation expenses |  |  | 393 | 6,141 | 999 |
Infrastructure [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 22,475 |  | 26,543 | 56,050 | 84,210 |
Segment operating income | 1,433 |  | 1,081 | (699) | 9,367 |
Capital Expenditures | 188 |  | 162 | 1,080 | 2,526 |
Depreciation and Amortization | 1,439 |  | 1,611 | 4,329 | 4,751 |
Assets | 112,433 |  | 109,523 | 112,433 | 109,523 | 113,869
Environmental remediation expenses |  |  | $ 69 | $ 1,084 | $ 176 |

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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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