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Industry Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Feb. 29, 2012
Nov. 30, 2011
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
Aug. 31, 2011
Segment Reporting Information [Line Items]            
Total operating revenues $ 132,134   $ 120,168 $ 251,339 $ 209,334  
Segment operating income 22,064 [1]   20,266 [1] 30,672 [1] 30,192 [1]  
Unallocated general and administrative expenses (3,116)   (3,205) (6,641) (6,521)  
Interest and other income (expense), net 479   (60) (163) (93)  
Earnings before income taxes 19,427   17,001 23,868 23,578  
Capital Expenditures 2,091   2,918 4,723 4,402  
Depreciation and Amortization 3,110   2,954 6,235 5,880  
Assets 393,600   343,257 393,600 343,257 381,144
Environmental remediation expenses   7,200   7,225 713  
Irrigation [Member]
            
Segment Reporting Information [Line Items]            
Operating revenues 116,988   91,658 217,764 151,667  
Segment operating income 23,019 [1]   16,005 [1] 32,804 [1] 21,906 [1]  
Capital Expenditures 1,795   1,182 3,831 2,038  
Depreciation and Amortization 1,675   1,388 3,345 2,740  
Assets 278,569   227,341 278,569 227,341 267,275
Environmental remediation expenses       6,100 6,100  
Infrastructure [Member]
            
Segment Reporting Information [Line Items]            
Operating revenues 15,146   28,510 33,575 57,667  
Segment operating income (955) [1]   4,261 [1] (2,132) [1] 8,286 [1]  
Capital Expenditures 296   1,736 892 2,364  
Depreciation and Amortization 1,435   1,566 2,890 3,140  
Assets 115,031   115,916 115,031 115,916 113,869
Environmental remediation expenses       $ 1,100 $ 1,100  
[1] There were no environmental remediation expenses allocated to the irrigation segment and the infrastructure segment, respectively, for the three months ended February 29, 2012 and February 28, 2011. Environmental remediation expenses of $6.1 million and $1.1 million were allocated to the irrigation segment and the infrastructure segment, respectively, for the six months ended February 29, 2012 and February 28, 2011.