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Acquisitions - Acquisition-Related Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
May. 31, 2015
Acquisitions          
Decrease of acquisition-related contingent consideration liabilities     $ (1,292) $ (3,266)  
Acquisition related costs $ 100 $ 200 200 200  
Contingent consideration 3,800   3,800   $ 6,400
Fiscal 2016 Acquisitions          
Acquisitions          
Decrease of acquisition-related contingent consideration liabilities $ 200   $ 1,300    
Fiscal 2015 Acquisitions          
Acquisitions          
Decrease of acquisition-related contingent consideration liabilities   $ 1,700   $ 3,300