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Industry Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Aug. 31, 2012
Segment Reporting Information [Line Items]      
Total operating revenues $ 147,370 $ 119,205  
Segment operating income 26,150 8,608  
Unallocated general and administrative expenses (3,886) (3,525)  
Interest and other income (expense), net 119 (642)  
Earnings before income taxes 22,383 4,441  
Capital Expenditures 2,215 2,632  
Depreciation and Amortization 3,130 3,125  
Environmental remediation expenses   7,225  
Assets 442,878 384,082 415,531
Irrigation [Member]
      
Segment Reporting Information [Line Items]      
Operating revenues 134,217 100,776  
Segment operating income 27,468 9,785  
Capital Expenditures 2,085 2,036  
Depreciation and Amortization 1,704 1,670  
Environmental remediation expenses   6,141  
Assets 331,872 270,395 303,741
Infrastructure [Member]
      
Segment Reporting Information [Line Items]      
Operating revenues 13,153 18,429  
Segment operating income (1,318) (1,177)  
Capital Expenditures 130 596  
Depreciation and Amortization 1,426 1,455  
Environmental remediation expenses   1,084  
Assets $ 111,006 $ 113,687 $ 111,790