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Income Taxes - Operating loss carryforwards (Details) - USD ($)
$ in Thousands
Feb. 28, 2019
Feb. 28, 2018
Deferred Tax Assets    
Subtotals $ 18,300 $ 32,829
Less portion of valuation allowance established for operating loss carryforwards (17,086)  
Total 1,214  
Operating Loss Carryforward    
Subtotals 70,704  
U.S.    
Deferred Tax Assets    
Operating loss carryforwards with indefinite carryover periods 1,051  
Operating Loss Carryforward    
Required future taxable income - operating loss carryforwards with indefinite carryover periods 5,005  
State    
Deferred Tax Assets    
Operating loss carryforwards with definite carryover periods 138  
Operating Loss Carryforward    
Required future taxable income - operating loss carryforwards with definite carryover periods 3,704  
Non-U.S.    
Deferred Tax Assets    
Operating loss carryforwards with indefinite carryover periods 12,395  
Operating loss carryforwards with definite carryover periods 4,716  
Operating Loss Carryforward    
Required future taxable income - operating loss carryforwards with indefinite carryover periods 44,396  
Required future taxable income - operating loss carryforwards with definite carryover periods $ 17,599