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Income Taxes - Operating loss carryforwards (Details) - USD ($)
$ in Thousands
Feb. 28, 2017
Feb. 29, 2016
Gross deferred tax assets    
Subtotals $ 16,799 $ 15,419
Less portion of valuation allowance established for operating loss carryforwards (15,954)  
Total 845  
Required future taxable income    
Subtotals 69,984  
U.S.    
Gross deferred tax assets    
Operating loss carryforwards with definite carryover periods 458  
Required future taxable income    
Required future taxable income - operating loss carryforwards with definite carryover periods 11,121  
Non-U.S.    
Gross deferred tax assets    
Operating loss carryforwards with definite carryover periods 1,418  
Operating loss carryforwards with indefinite carryover periods 14,923  
Required future taxable income    
Required future taxable income - operating loss carryforwards with definite carryover periods 8,349  
Required future taxable income - operating loss carryforwards with indefinite carryover periods $ 50,514