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Share-Based Compensation - Weighted-Average Assumptions Used for Employee Purchase Rights Granted Under Stock Purchase Plan (Detail) (USD $)
6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield 0.00% 0.00%
Stock Purchase Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair market value $ 40.94 $ 35.20
Option price $ 38.89 $ 33.44
Expected dividend yield 0.00% 0.00%
Expected volatility 18.00% 22.00%
Risk free interest rate 0.06% 0.04%