Stock-Based Compensation (Performance-Contingent Total Shareholder Return Shares) - Additional Information (Detail)	6 Months Ended
	Jul. 18, 2015	Jul. 12, 2014	Jul. 13, 2013
Total Shareholders Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of actual ROI attainment	88.00%
2012 awards | Total Shareholders Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of actual ROI attainment	195.00%
Performance Contingent Total Shareholders Return Shares | Performance contingent Awards 2013, 2014 and 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years	2 years	2 years
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
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.