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Restructuring Activities - Additional Information (Detail) - USD ($)
12 Months Ended
May 31, 2017
Feb. 28, 2017
Discontinued Operations, Disposed of by Means Other than Sale [Member]    
Restructuring Cost and Reserve [Line Items]    
One time termination or material costs to be recognized $ 0  
Liability related to restructuring 0 $ 0
Inventory and Fixed Asset [Member] | Discontinued Operations, Disposed of by Means Other than Sale [Member]    
Restructuring Cost and Reserve [Line Items]    
Losses related to the restructuring 222,000  
Inventory and Fixed Asset [Member] | Discontinued Operations, Disposed of by Sale [Member]    
Restructuring Cost and Reserve [Line Items]    
Losses related to the restructuring $ 170,000