Summary of Company's Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	4 Months Ended
	Apr. 21, 2018	Apr. 22, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 3,375	$ 5,975
Performance Contingent Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	2,853	5,367
Deferred and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 522	$ 608