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Stock-Based Compensation (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options exercise prices as percentage of the market value on the date of the grant     100.00%  
Compensation expense for stock options $ 0.3 $ 1.9 $ 9.5 $ 9.3
Exercise of stock options total 4.3   10.5  
Number of anniversaries of grant date upon which restricted stock units vest     3  
RSU [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense related to unvested restricted stock 32.3   32.3  
Weighted-average recognition period for unrecognized compensation expense related to unvested restricted stock (years)     2 years 1 month 6 days  
Installments in which restricted stock units vest and are converted to common stock     3  
Compensation expense 4.7 6.5 29.6 26.2
LTIP [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Portion of restricted stock award vesting on anniversary     0.333  
AIP [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Amount of annual incentive award payment participant can elect to defer.     50.00%  
Additional common stock units for election of deferred annual incentive award, percentage     25.00%  
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense related to unvested restricted stock 0.8   0.8  
Weighted-average recognition period for unrecognized compensation expense related to unvested restricted stock (years)     8 months 12 days  
AIP And LTIP [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense related to unvested restricted stock 0.8   0.8  
Weighted-average recognition period for unrecognized compensation expense related to unvested restricted stock (years)     1 year 7 months 6 days  
Compensation expense $ 0.5 $ 0.4 $ 3.6 $ 4.7
Stock Options Granted in 2010, 2011 and 2012 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options vesting period     3 years  
Stock options term, years     10