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Acquisitions - Preliminary Purchase Price Allocation (Details)
$ in Thousands
9 Months Ended
Feb. 29, 2016
USD ($)
Entity
May. 31, 2015
USD ($)
May. 31, 2014
USD ($)
Acquisitions      
Contingent consideration $ 3,800 $ 6,400  
Goodwill $ 166,719 $ 166,414 $ 130,516
United States | Fiscal 2016 Acquisitions      
Acquisitions      
Number of Entities | Entity 1    
Cash paid $ 1,750    
Contingent consideration 945    
Consideration transferred 2,695    
Current assets 145    
Property, plant and equipment 485    
Goodwill 2,658    
Current liabilities (521)    
Long-term deferred tax liability (72)    
Net assets acquired $ 2,695