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Stock-Based Compensation (Details) (USD $)
6 Months Ended 1 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2012
Performance Stock Units [Member]
Sep. 25, 2011
Performance Stock Units [Member]
May 31, 2012
Restricted Stock [Member]
Apr. 30, 2011
Restricted Stock [Member]
Sep. 30, 2012
Restricted Stock [Member]
Sep. 30, 2012
Second Amended and Restated 1994 Stock and Incentive Plan [Member]
Restricted Stock [Member]
Sep. 30, 2012
2012 Grant Year [Member]
Restricted Stock [Member]
Sep. 30, 2012
Selling, General and Administrative Expenses [Member]
Performance Stock Units [Member]
Sep. 25, 2011
Selling, General and Administrative Expenses [Member]
Performance Stock Units [Member]
Sep. 30, 2012
Selling, General and Administrative Expenses [Member]
Performance Stock Units [Member]
Sep. 25, 2011
Selling, General and Administrative Expenses [Member]
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Non-cash stock-based compensation               $ 764,900 $ 701,400 $ 1,102,700 $ 1,522,700
Income tax benefit from share-based compensation 2,140,200 471,600                  
Shares earned (in shares) 343,858                    
Number of additional shares authorized (in shares) 151,200                    
Unrecognized compensation costs $ 3,500,000       $ 600,000   $ 800,000        
Unrecognized compensation costs, period for recognition         4 years            
Stock granted (in shares)     20,100 36,000   225,000          
Granted, weighted average fair value at grant date (in dollars per share) $ 19.30         $ 10.56          
Shares unvested (in shares) 495,058       90,000            
Vesting Period         4 years            
Nonvested PSU shares, Outstanding [Roll Forward]                      
Unvested shares available for issue under outstanding PSUs, beginning of period (in shares) 604,844                    
Unvested shares available for issue under outstanding PSUs, beginning of period (in dollars per share) $ 9.81                    
Granted (in shares) 151,200                    
Granted, weighted average fair value at grant date (in dollars per share) $ 19.30         $ 10.56          
Vested (in shares) (258,186)                    
Vested, weighed average fair value at grant date (in dollars per share) $ 8.87                    
Forfeited/cancelled (in shares) (2,800)                    
Forfeited/cancelled, weighted average fair value at grant date (in dollars per share) $ 10.89                    
Unvested shares available for issue under outstanding PSUs, end of period (in shares) 495,058       90,000            
Unvested shares available for issue under outstanding PSUs, end of period (in dollars per share) $ 13.19