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Schedule of Estimated Fair Value of Stock Options Grant Using Black Scholes Option Pricing Model (Detail) - Stock Options
6 Months Ended
Jul. 05, 2015
Jun. 29, 2014
Share-based Compensation Arrangement by Share-based Payment Award    
Expected life (years) 4 years 4 years
Risk-free interest rate 1.10% 1.20%
Volatility-historical 33.40% 38.80%
Dividend yield 1.33% 1.25%