Stock-Based Compensation (Performance-Contingent Total Shareholder Return Shares) - Additional Information (Detail)	6 Months Ended
	Jul. 16, 2016
Performance Contingent Total Shareholders Return Shares | Performance contingent Awards 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	18 months
Performance Contingent Total Shareholders Return Shares | Performance contingent Awards 2013, 2014,2015 and 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years
Total Shareholders Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, fair value assumptions, method used	Inputs into the model included the following for the company and comparator companies: (i) TSR from the beginning of the performance cycle through the measurement date; (ii) volatility; (iii) risk-free interest rates; and (iv) the correlation of the comparator companies’ TSR. The inputs are based on historical capital market data.
Total Shareholders Return | 2014 awards | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vested shares	27.00%
Total Shareholders Return | 2013 Awards | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vested shares	88.00%