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Industry Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) (USD $)
 3 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2011
Segment Reporting Information [Line Items]      
Total operating revenues $ 147,671,000 $ 147,370,000  
Segment operating income 20,819,000 26,150,000  
Unallocated general and administrative expenses (4,827,000) (3,886,000)  
Interest and other income (expense), net (175,000) 119,000  
Earnings before income taxes 15,817,000 22,383,000  
Capital Expenditures 2,387,000 2,215,000  
Depreciation and Amortization 3,707,000 3,130,000  
Environmental remediation expenses     7,200,000
Irrigation [Member]
      
Segment Reporting Information [Line Items]      
Number of operating segments 13    
Total operating revenues 129,183,000 134,217,000  
Segment operating income 20,311,000 27,468,000  
Capital Expenditures 2,228,000 2,085,000  
Depreciation and Amortization 2,358,000 1,704,000  
Infrastructure [Member]
      
Segment Reporting Information [Line Items]      
Number of operating segments 2    
Total operating revenues 18,488,000 13,153,000  
Segment operating income 508,000 (1,318,000)  
Capital Expenditures 159,000 130,000  
Depreciation and Amortization $ 1,349,000 $ 1,426,000