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Financial Instruments and Risk Management (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2013
VEF / $
May. 31, 2015
USD ($)
VEF / $
May. 31, 2014
USD ($)
VEF / $
SG&A      
Foreign Currency Risk and Currency Exchange Uncertainties      
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps | $   $ (880) $ (30)
Income Tax Expense (Benefit) [Member]      
Foreign Currency Risk and Currency Exchange Uncertainties      
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps | $   $ 140 $ 40
Venezuelan Bolivar      
Currency Exchange Uncertainties      
Value of foreign currency before devaluation (in Bolivars per dollar) 4.30    
Value of foreign currency after devaluation (in Bolivars per dollar) 6.30    
Foreign currency exchange rate ( in foreign currency per dollar)   6.30  
Venezuelan Bolivar | SICAD 1      
Currency Exchange Uncertainties      
Foreign currency exchange rate ( in foreign currency per dollar)     12
Venezuelan Bolivar | SIMADI Foreign Exchange Mechanism [Member]      
Currency Exchange Uncertainties      
Foreign currency exchange rate ( in foreign currency per dollar)   199  
Geographic concentration | Venezuela      
Foreign Currency Risk and Currency Exchange Uncertainties      
Percentage of net sales   1.20% 0.60%
Currency Exchange Uncertainties      
Net investment | $   $ 11,600  
Net sales revenue | Geographic concentration | International operations - transactions denominated in foreign currencies      
Foreign Currency Risk and Currency Exchange Uncertainties      
Percentage of net sales   14.00% 15.00%