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Financial Instruments and Risk Management (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 29, 2016
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
May 31, 2016
Feb. 29, 2016
Nov. 30, 2015
Aug. 31, 2015
May 31, 2015
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Foreign Currency Risk and Currency Exchange Uncertainties                        
Concentration risk percentage                   44.00% 44.00%  
Currency Exchange Uncertainties                        
Sales revenue, net   $ 376,697 $ 444,414 $ 368,170 $ 347,938 $ 385,724 $ 445,503 $ 369,129 $ 345,345 $ 1,537,219 $ 1,545,701 $ 1,445,131
Operating income                   164,332 130,615 161,719
SG&A                        
Foreign Currency Risk and Currency Exchange Uncertainties                        
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps                   $ 500 $ (3,100) $ (5,700)
Venezuela                        
Foreign Currency Risk and Currency Exchange Uncertainties                        
Charge from re-measurement of monetary assets and liabilities due to an exchange rate change $ 9,570                      
Net sales revenue | Geographic concentration | International operations - transactions denominated in foreign currencies                        
Foreign Currency Risk and Currency Exchange Uncertainties                        
Concentration risk percentage                   12.00% 14.00% 14.00%