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Inventories (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2016
May 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
May 31, 2014
Inventories            
Raw materials $ 21,669 $ 28,040        
Work in process 10,700 11,910        
Finished goods 23,001 27,438        
Total 55,370 67,388 $ 68,767 $ 75,372 $ 71,306 $ 61,740
Inventory valuation reserve 12,600 $ 7,800        
Inventory write-off $ 5,800