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Significant Accounting Matters (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2018
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
May 31, 2016
Feb. 28, 2018
Dec. 31, 2017
Feb. 28, 2017
Feb. 29, 2016
Change in Accounting Estimate                          
Corporate income tax rate (as a percent) 21.00%                 32.70% 35.00% 35.00% 35.00%
Blended U.S. federal statutory rate (as a percent)                   32.70%      
Provisional tax expense related to one-time remeasurement of our U.S. deferred tax assets and liabilities                   $ 17,900      
Expected percentage reduction in annual effective tax rate due to the Tax Act                   1.00%      
Charge from re-measurement of monetary assets and liabilities due to an exchange rate change                         $ 9,570
Asset impairment charges   $ 11,447     $ 4,000 $ 500     $ 2,400 $ 15,447   $ 2,900 6,000
Cash and cash equivalents   20,738       23,848       20,738   23,848 227,464
Inventory   251,511       280,877       251,511   280,877  
Property and equipment, net   $ 123,503       $ 126,502       123,503   126,502  
Net investment in Venezuelan operations                         149
Operating income (loss)                   $ 169,062   $ 169,664 $ 116,294
Total earnings per share - diluted   $ 2.22 $ (1.12) $ 0.33 $ 0.22 $ 1.30 $ 2.07 $ 1.00 $ 0.68 $ 1.63   $ 5.04 $ 3.52
Before Adjustment                          
Change in Accounting Estimate                          
Net investment in Venezuelan operations                         $ 18,882
Adjustments                          
Change in Accounting Estimate                          
Net investment in Venezuelan operations                         (18,733)
Venezuela                          
Change in Accounting Estimate                          
Asset impairment charges                         9,160
SG&A                          
Change in Accounting Estimate                          
Cash and cash equivalents                         10
Other net assets, principally working capital other than inventory                         (164)
Property and equipment, net                         3
SG&A | Before Adjustment                          
Change in Accounting Estimate                          
Cash and cash equivalents                         1,302
Other net assets, principally working capital other than inventory                         8,120
Property and equipment, net                         82
SG&A | Adjustments                          
Change in Accounting Estimate                          
Cash and cash equivalents                         (1,292)
Other net assets, principally working capital other than inventory                         (8,284)
Property and equipment, net                         (79)
Cost of goods sold                          
Change in Accounting Estimate                          
Inventory                         300
Cost of goods sold | Before Adjustment                          
Change in Accounting Estimate                          
Inventory                         9,378
Cost of goods sold | Adjustments                          
Change in Accounting Estimate                          
Inventory                         $ (9,078)