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Consolidated Statements of Changes in Stockholders' Equity and Comprehensive Income (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive Loss
Preferred Share Rights
Retained Earnings (Accumulated Deficit)
Balances at Mar. 31, 2011 $ 361,832 $ 503 $ 387,932 $ (416) $ 0 $ 0 $ (26,187)
Treasury stock, shares at Mar. 31, 2011       160,000      
Common stock, shares at Mar. 31, 2011   50,276,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation 3,078   3,078        
Exercise of stock options 889 1 888        
Exercise of stock options, shares 86,900 87,000          
Preferred share rights 0         283 (283)
Issuance of shares related to restricted stock 1 1          
Issuance of shares related to restricted stock, shares   103,000          
Shares surrendered as payment of tax withholding (271)     (271)      
Shares surrendered as payment of tax withholding, shares       21,000      
Components of comprehensive income:              
Net income 37,212           37,212
Translation adjustments (13)       (13)    
Comprehensive income 37,199            
Balances at Mar. 31, 2012 402,728 505 391,898 (687) (13) 283 10,742
Treasury stock, shares at Mar. 31, 2012       181,000      
Common stock, shares at Mar. 31, 2012   50,466,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation 3,772   3,772        
Exercise of stock options 6,029 7 6,022        
Exercise of stock options, shares 786,500 786,000          
Issuance of shares related to restricted stock   1 (1)        
Issuance of shares related to restricted stock, shares 0 59,000          
Components of comprehensive income:              
Net income 65,505           65,505
Translation adjustments (91)       (91)    
Comprehensive income 65,414            
Balances at Mar. 31, 2013 477,943 513 401,691 (687) (104) 283 76,247
Treasury stock, shares at Mar. 31, 2013 181,000     181,000      
Common stock, shares at Mar. 31, 2013   51,311,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation 5,146   5,146        
Exercise of stock options 5,907 6 5,901        
Exercise of stock options, shares 605,000 605,000          
Preferred share rights 0         (283) 283
Issuance of shares related to restricted stock 0 1 (1)        
Issuance of shares related to restricted stock, shares   105,000          
Treasury share repurchases (744)     (744)      
Excess tax benefits from share-based awards 1,650   1,650        
Treasury share repurchases, shares       25,000      
Components of comprehensive income:              
Net income 72,615           72,615
Translation adjustments 843       843    
Comprehensive income 73,458            
Balances at Mar. 31, 2014 $ 563,360 $ 520 $ 414,387 $ (1,431) $ 739 $ 0 $ 149,145
Treasury stock, shares at Mar. 31, 2014 206,000     206,000      
Common stock, shares at Mar. 31, 2014   52,021,000