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Performance Contingent ROIC Shares (Detail) (Return On Invested Capital, USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended
Jul. 12, 2014
Grant Date January First Twenty Fourteen
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares granted 366
Vesting date Mar. 01, 2016
Fair value per share $ 21.47
Grant Date January First Twenty Thirteen
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares granted 414
Vesting date Mar. 01, 2015
Fair value per share $ 15.51