Quarterly report pursuant to Section 13 or 15(d)

Schedule of Assumption Used and Resulting Weighted Average Fair Value of Stock Option Granted (Detail)

v2.4.0.8
Schedule of Assumption Used and Resulting Weighted Average Fair Value of Stock Option Granted (Detail) (USD $)
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Share Based Payment Award Stock Options Valuation Assumptions [Line Items]    
Expected volatility, minimum 24.00% 27.00%
Expected volatility, maximum 29.00% 31.00%
Weighted average expected volatility 26.60% 30.00%
Dividend yield 2.30% 2.50%
Risk-free interest rate, minimum 0.10% 0.10%
Risk-free interest rate, maximum 2.00% 2.10%
Weighted average grant date fair value $ 32.25 $ 33.43
Minimum
   
Share Based Payment Award Stock Options Valuation Assumptions [Line Items]    
Expected term 5 years 7 months 6 days 5 years 7 months 6 days
Maximum
   
Share Based Payment Award Stock Options Valuation Assumptions [Line Items]    
Expected term 7 years 4 months 24 days 7 years 6 months