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Shareholders' Equity - Changes in Shareholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 103 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning Balance, Amount $ 251,355    
Beginning Balance, Shares 30,053,443    
Net earnings $ 7,784 $ (16,878)  
Adjustment to pension, net of deferred tax of $152 248    
Dividends paid ($0.175 per share) (4,468)    
Stock based compensation 333    
Stock repurchases $ (3,310)    
Stock repurchases, shares (191,033)   (1,442,236)
Ending Balance, Amount $ 251,942   $ 251,942
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 $ 121,525    
Stock based compensation 333    
Exercise of stock options and restricted stock (1,467)    
Ending Balance, Amount 120,391   $ 120,391
Retained Earnings [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning Balance, Amount 150,685    
Net earnings 7,784    
Dividends paid ($0.175 per share) (4,468)    
Ending Balance, Amount 154,001   154,001
Accumulated Other Comprehensive Income (Loss) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning Balance, Amount (15,261)    
Adjustment to pension, net of deferred tax of $152 248    
Ending Balance, Amount (15,013)   (15,013)
Treasury Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning Balance, Amount $ (80,728)    
Beginning Balance, Treasury Stock, Shares (4,686,821)    
Exercise of stock options and restricted stock $ 1,467    
Exercise of stock options and restricted stock, shares 85,189    
Stock repurchases $ (3,310)    
Stock repurchases, shares (191,033)    
Ending Balance, Amount $ (82,571)   $ (82,571)
Ending Balance, Treasury Stock, Shares (4,792,665)   (4,792,665)