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Property, Plant, and Equipment, at Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
May 31, 2013
Property, plant and equipment              
Property, plant and equipment $ 90,097 $ 88,943          
Less accumulated depreciation and amortization (43,536) (36,197)          
Property, plant and equipment excluding land and land improvements 46,561 52,746          
Land and land improvements 1,723 1,704          
Property, plant and equipment, Net 48,284 54,450 $ 66,455 $ 58,215 $ 66,723 $ 66,189 $ 62,375
Depreciation expense 8,200 9,800 8,400        
Additional depreciation due to change in useful life 1,000 1,500 $ 800        
Building and building improvements              
Property, plant and equipment              
Property, plant and equipment 39,585 33,853          
Machinery and equipment              
Property, plant and equipment              
Property, plant and equipment 24,078 23,626          
Computer software and equipment              
Property, plant and equipment              
Property, plant and equipment 24,691 24,431          
Construction in progress              
Property, plant and equipment              
Property, plant and equipment $ 1,743 $ 7,033