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Financial Instruments and Risk Management (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2016
VEF / $
Mar. 31, 2016
VEF / $
Feb. 29, 2016
VEF / $
May 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
May 31, 2015
USD ($)
Feb. 29, 2016
Currency Exchange Uncertainties              
Sales revenue, net       $ 347,938   $ 345,345  
Operating income       22,898   26,543  
SG&A              
Foreign Currency Risk and Currency Exchange Uncertainties              
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps       240   (880)  
Income tax expense              
Foreign Currency Risk and Currency Exchange Uncertainties              
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps       10   140  
Venezuelan Bolivar | SIMADI              
Foreign Currency Risk and Currency Exchange Uncertainties              
Value of foreign currency after devaluation (in Bolivars per dollar) | VEF / $ 205            
Venezuelan Bolivar | DIPRO              
Foreign Currency Risk and Currency Exchange Uncertainties              
Value of foreign currency before devaluation (in Bolivars per dollar) | VEF / $     6.30        
Value of foreign currency after devaluation (in Bolivars per dollar) | VEF / $     10.00        
Venezuelan Bolivar | DICOM              
Foreign Currency Risk and Currency Exchange Uncertainties              
Value of foreign currency after devaluation (in Bolivars per dollar) | VEF / $   207          
Chinese Renminbi              
Currency Exchange Uncertainties              
Percentage increase in Chinese renminbi against the U.S. Dollar             6.00%
Venezuela              
Foreign Currency Risk and Currency Exchange Uncertainties              
Charge from re-measurement of monetary assets and liabilities due to an exchange rate change         $ 18,730    
Currency Exchange Uncertainties              
Sales revenue, net       230   4,110  
Operating income       $ (100)   $ 1,580  
Net sales revenue | Geographic concentration | International operations - transactions denominated in foreign currencies              
Foreign Currency Risk and Currency Exchange Uncertainties              
Concentration risk percentage       14.00%   14.00%