v2.4.0.6
Stock Options Plans and Stock Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Y
Jan. 01, 2011
Jan. 02, 2010
Dec. 31, 2005
Dec. 30, 2011
Apr. 01, 2011
May 29, 2009
Nov. 08, 2005
Oct. 10, 2005
Dec. 31, 2004
Dec. 31, 2011
Maximum [Member]
Y
Dec. 31, 2011
Minimum [Member]
Y
Jul. 01, 2011
Director [Member]
Jul. 01, 2011
Management [Member]
Dec. 31, 2011
2005 Plan [Member]
Oct. 10, 2005
2005 Plan [Member]
Dec. 31, 2011
Restricted Stock Awards [Member]
Dec. 31, 2011
Restricted Stock Units [Member]
Dec. 30, 2011
Restricted Stock Units [Member]
Sep. 30, 2011
Restricted Stock Units [Member]
Apr. 01, 2011
Restricted Stock Units [Member]
Jan. 01, 2011
Restricted Stock Units [Member]
Jan. 02, 2010
Restricted Stock Units [Member]
Dec. 30, 2011
Restricted Stock Units [Member]
Director [Member]
Jul. 01, 2011
Restricted Stock Units [Member]
Director [Member]
Dec. 30, 2010
Restricted Stock Units [Member]
Director [Member]
Jul. 01, 2011
Restricted Stock Units [Member]
Management [Member]
Dec. 31, 2011
Stock Options [Member]
Dec. 30, 2011
Stock Options [Member]
Apr. 01, 2011
Stock Options [Member]
Dec. 31, 2011
Stock Options (excluding new options) [Member]
Dec. 30, 2011
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                
Shares reserved for issuance in different forms                               1,583,682                                
Stock based compensation expense for stock options and restricted stock units granted subsequent to initial S-1 filing $ 5.2                               $ 0 $ 3.6                            
Unamortized fair value of restricted stock units                                 0 11.7       7.6 3.2                  
Contractual term of the stock option grants                     10 7                                        
Share based compensation arrangement shares available for grant 2,695,397                           2,695,397                                  
Share based compensation arrangement units granted                                     7,500   19,000     7,370 6,118       15,000 40,000    
Share based compensation arrangement shares each for nine directors                                                     3,059          
Minimum vesting period for options                                                       0 Years     4 Years  
Maximum vesting period for options                                                       5 Years     5 Years  
Minimum expiration period for options                                                       7 Years        
Maximum expiration period for options                                                       10 Years        
Minimum period for expiration of options in case of employee termination                                                       60 days        
Maximum period for expiration of options in case of employee termination                                                       90 days        
Percentage of stock vested on anniversary of grant date                         25.00% 100.00%           25.00% 25.00%         25.00%     25.00% 25.00%   25.00%
Annual merit grants                                       43,400 141,575                 281,150    
Stock Options Plans and Stock Based Compensation (Textual) [Abstract]                                                                
Effective date for stock options plan                 Oct. 10, 2005                                              
Increase in number of shares reserved and available for issuance in different forms   4.50%                                                            
Fair value of common stock               $ 21.60   $ 4.60                                            
Deferred Compensation based on estimated fair value of its common stock       3.4                                                        
Stock based compensation expense 0 0.1 0.2                                                          
Unamortized fair value stock options granted 11.0                                                              
Weighted average remaining recognition period 2.39                                                              
New Options issued to purchase common stock             310,607                                                  
Cancellation of options to purchase common stock             678,850                                                  
Weighted average fair value of each stock option granted $ 16.55 $ 8.24 $ 4.91                                                          
Closing market value of stock $ 29.85                                                              
Total intrinsic value of stock options exercised 25.4 7.5 2.0                                                          
Stock-based compensation expense Expects to recognize in year one related to restricted stock units 3.9                                                              
Stock-based compensation expense Expects to recognize in year two related to restricted stock units 3.5                                                              
Stock-based compensation expense Expects to recognize in year three related to restricted stock units 3.1                                                              
Stock-based compensation expense Expects to recognize in year four related to restricted stock units $ 1.2                                                              
Weighted average exercise price, exercisable $ 14.51       $ 29.85 $ 33.48