Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Expense (Details)

v3.4.0.3
Stock-Based Compensation Expense (Details) - USD ($)
 12 Months Ended
May. 05, 2011
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Jul. 28, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Benefit (loss) from excess tax deduction from option exercises   $ 92,000 $ 1,592,000 $ (118,000)    
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net   92,000 1,592,000 $ (118,000)    
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition   3,749,000 3,295,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]            
Exercised (in shares)       (18,786)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]            
Exercised, weighted average exercise price (in dollars per share)       $ 21.52    
Stock compensation expense   3,749,000 3,295,000 $ 2,203,000    
Total fair value of options issued     289,000      
Restricted Stock and Stock Option Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares of the company's common stock that may be awarded           2,767,171
2011 Long-term Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares of the company's common stock that may be awarded           2,893,341
IPO [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock compensation expense associated with the acceleration of the pre-IPO options $ 6,310,000          
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Intrinsic value of stock options exercised   $ 384,000 $ 1,654,000 $ 10,285,000    
Vesting period (in years)   5 years        
Annual vesting percentage   20.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]            
Options outstanding, beginning of period (in shares)   465,042.000 558,466 1,132,780    
Exercised (in shares)   (29,056) (88,050) (566,487)    
Forfeited (in shares)   (2,260) (5,374) (7,827)    
Options outstanding, end of period (in shares)   433,726.000 465,042.000 558,466    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]            
Options outstanding, weighted average exercise price (in dollars per share)   $ 8.07 $ 8.12 $ 7.96 $ 6.98  
Exercised, weighted average exercise price (in dollars per share)   8.25 6.87 5.90    
Forfeited, weighted average exercise price (in dollars per share)   17.10 $ 12.04 $ 15.73    
Closing price (in dollars per share)   $ 17.56        
Total unrecognized expense related to non-vested stock option awards   $ 168,000        
Stock based compensation, recognition period   8 months 11 days        
Stock Options [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]            
Expiration term   10 years        
Stock Options [Member] | IPO [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options, vested and exercisable (in shares) 2,757,524          
Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]            
Total fair value of options issued   $ 385        
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]            
Exercised (in shares)   0 (18,000) (21,000)    
Forfeited (in shares)   0 0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]            
Granted, weighted average exercise price (in dollars per share)   $ 0.00 $ 0.00 $ 20.09    
Exercised, weighted average exercise price (in dollars per share)   0.00 20.09 18.09    
Forfeited, weighted average exercise price (in dollars per share)   $ 0.00 $ 0.00 $ 0.00    
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]            
Forfeited (in shares)   (8,669,000) (4,284,000) (1,660,000)    
Vested shares   31,658,000 19,446,000 12,254,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]            
Total unrecognized expense related to non-vested stock option awards   $ 871,000        
Stock based compensation, recognition period   1 year 7 months 28 days        
Total fair value of options issued   $ 1,113,000 $ 1,187,000 $ 480,000    
Amortization Period For The Fair Value Share Based Compsensation Award (in years)   3 years        
Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net     1,592,000 (118,000)    
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition   $ 3,749,000 $ 3,295,000 $ 2,203,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]            
Exercised (in shares)   (29,056) (88,050) (566,487)