General form of registration statement for all companies including face-amount certificate companies

Stock-Based Compensation (Narrative) (Detail)

v2.4.0.6
Stock-Based Compensation (Narrative) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 23, 2012
Sep. 25, 2011
Dec. 25, 2011
Dec. 26, 2010
Dec. 27, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation $ 252 $ 263 $ 352 $ 310 $ 235
Estimated fair value of the common stock, per share $ 22.73   $ 12.77    
Weighted-average grant date fair value of options granted $ 6.07   $ 5.71 $ 4.17 $ 3.12
Total unrecognized compensation costs 877   607    
Immediately recognized unrecognized compensation costs $ 682   $ 607    
2006 Plan
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum term 10 years        
Options granted on the first anniversary of the date of grant, percentage 20.00%        
Options granted on the second anniversary of the date of grant, percentage 20.00%        
Options granted on the third anniversary of the date of grant, percentage 20.00%        
Options granted on the fourth anniversary of the date of grant, percentage 20.00%        
Options granted on the fifth anniversary of the date of grant, percentage 20.00%        
2006 Plan | Pre Amended Plan
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for issuance 1,004,957        
2006 Plan | Amended Plan
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for issuance 1,070,209        
2012 Omnibus Equity Incentive Plan [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum term 10 years        
Options granted on the first anniversary of the date of grant, percentage 20.00%        
Options granted on the second anniversary of the date of grant, percentage 20.00%        
Options granted on the third anniversary of the date of grant, percentage 20.00%        
Options granted on the fourth anniversary of the date of grant, percentage 20.00%        
Options granted on the fifth anniversary of the date of grant, percentage 20.00%        
Shares of common stock are reserved and available for issuance 1,250,000