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Financial Instruments and Risk Management (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2016
VEF / $
Mar. 31, 2016
VEF / $
Feb. 29, 2016
VEF / $
Aug. 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
Aug. 31, 2015
USD ($)
Aug. 31, 2016
USD ($)
Aug. 31, 2015
USD ($)
Currency Exchange Uncertainties                
Sales revenue, net       $ 368,170   $ 369,129 $ 716,108 $ 714,474
Operating income       37,487   32,432 60,385 58,975
SG&A                
Foreign Currency Risk and Currency Exchange Uncertainties                
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps       (730)   (1,220) (490) (2,100)
Income tax expense                
Foreign Currency Risk and Currency Exchange Uncertainties                
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps       $ 60   (70) $ 70 70
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%     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       $ 140   5,930 $ 370 10,040
Operating income       $ (10)   $ 1,740 $ (110) $ 3,320
Net sales revenue | Geographic concentration | International operations - transactions denominated in foreign currencies                
Foreign Currency Risk and Currency Exchange Uncertainties                
Concentration risk percentage       11.00%   15.00% 12.00% 15.00%