Acquisition (Alpine Valley Bread Company) - Additional Information (Detail) - Alpine Valley Bread Company $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 13, 2015 USD ($) shares	Dec. 31, 2016 USD ($)	Dec. 30, 2017 USD ($) ProductionFacility	Jan. 02, 2016 USD ($)
Business Acquisition [Line Items]
Percentage of stock acquired	100.00%
Date of acquisition			Oct. 13, 2015
Business acquisition, description			On October 13, 2015, the company completed the acquisition of 100% of the outstanding common stock of Alpine, a leading organic bread baker, from its shareholders for total consideration of $121.9 million inclusive of payments for certain tax benefits. We paid cash of $109.3 million and issued 12,602 shares of our common stock to the sellers in a private placement.
Total consideration paid	$ 121,942
Cash consideration paid	$ 109,340
Common shares issued for acquisition | shares	12,602
Goodwill acquired	$ 36,500
Acquisition-related costs				$ 1,600
Sales related to acquisition				$ 11,900
Number of production facility | ProductionFacility			2
Fair value of trade receivable			$ 4,800
Gross amount receivable			$ 4,800
Working Capital Adjustments
Business Acquisition [Line Items]
Change in goodwill related to acquisitions		$ 500