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Shareholders' Equity - Changes in Shareholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2015
Aug. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning Balance, Amount     $ 284,680  
Beginning Balance, Shares     30,053,443  
Net earnings $ 11,046 $ 10,016 $ 20,217 $ 18,048
Foreign currency translation, net of deferred tax of $2,006 (2,611) $ (445) (3,275) $ 535
Dividends paid ($.35 per share)     (9,012)  
Stock based compensation     657  
Ending Balance, Amount $ 293,267   $ 293,267  
Ending Balance, Shares 30,053,443   30,053,443  
Common Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning Balance, Amount     $ 75,134  
Beginning Balance, Shares     30,053,443  
Ending Balance, Amount $ 75,134   $ 75,134  
Ending Balance, Shares 30,053,443   30,053,443  
Additional Paid-in Capital [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning Balance, Amount     $ 121,687  
Stock based compensation     657  
Exercise of stock options and restricted stock grants     (1,352)  
Ending Balance, Amount $ 120,992   120,992  
Retained Earnings [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning Balance, Amount     188,413  
Net earnings     20,217  
Dividends paid ($.35 per share)     (9,012)  
Ending Balance, Amount 199,618   199,618  
Accumulated Other Comprehensive Income (Loss) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning Balance, Amount     (22,197)  
Foreign currency translation, net of deferred tax of $2,006     (3,275)  
Ending Balance, Amount (25,472)   (25,472)  
Treasury Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning Balance, Amount     $ (78,357)  
Beginning Balance, Treasury Stock, Shares     (4,514,905)  
Exercise of stock options and restricted stock grants     $ 1,352  
Exercise of stock options and restricted stock grants, shares     77,900  
Ending Balance, Amount $ (77,005)   $ (77,005)  
Ending Balance, Treasury Stock, Shares (4,437,005)   (4,437,005)