Basis of Presentation - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 27, 2015 USD ($)	Sep. 27, 2015 USD ($) Segment
Organization And Description Of Business [Line Items]
Number of reportable segment		1
Number of operating segment		1
Recognized gift card breakage income | $	$ 0.1	$ 0.8
Inventory shrink reserve | $	$ 3.8	$ 3.8
Produce [Member] | Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Organization And Description Of Business [Line Items]
Approximate net sales from produce in the first half of the fiscal year		25.00%