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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2013
May 31, 2012
Liabilities:    
Contingent consideration $ 5,144 $ 2,371
Recurring basis | Level 3
   
Liabilities:    
Contingent consideration 15,438 13,513
Total Liabilities 15,438 13,513
Recurring basis | Total
   
Liabilities:    
Contingent consideration 15,438 13,513
Total Liabilities $ 15,438 $ 13,513