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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Feb. 28, 2015
Nov. 30, 2014
Feb. 28, 2014
May. 31, 2015
Aug. 31, 2014
Finite Lived Intangible Assets [Line Items]          
Goodwill       $ 96,440 $ 95,499
Fair value inputs, discount rate 9.00%        
Fair value inputs, long-term revenue growth rate 4.50%        
Fair value inputs, terminal growth rate 2.00%        
GT 85 Limited [Member]          
Finite Lived Intangible Assets [Line Items]          
Purchase consideration   $ 4,100      
Cash paid   3,700      
Goodwill   1,300      
Goodwill expected to be deductible for tax purposes   1,300      
Establissments Decloedt [Member]          
Finite Lived Intangible Assets [Line Items]          
Cash paid     $ 1,800    
Customer-Related [Member] | GT 85 Limited [Member]          
Finite Lived Intangible Assets [Line Items]          
Purchase consideration   $ 1,700      
Estimated useful life   8 years      
Trade Names [Member] | GT 85 Limited [Member]          
Finite Lived Intangible Assets [Line Items]          
Purchase consideration   $ 900      
Estimated useful life   10 years      
Technology-Based [Member] | GT 85 Limited [Member]          
Finite Lived Intangible Assets [Line Items]          
Purchase consideration   $ 200      
Estimated useful life   4 years      
Customer Lists [Member] | Establissments Decloedt [Member]          
Finite Lived Intangible Assets [Line Items]          
Estimated useful life     5 years