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Commitments And Contingencies (Details) (USD $)
 3 Months Ended
Nov. 30, 2011
May 31, 2014
Aug. 31, 2013
May 31, 2013
Commitments And Contingencies [Abstract]        
Environmental remediation expense $ 7,200,000      
Other current liabilities   1,444,000 1,740,000 2,050,000
Other noncurrent liabilities   5,025,000 5,200,000 5,200,000
Total environmental remediation liabilities   $ 6,469,000 $ 6,940,000 $ 7,250,000