Acquisitions (Sara Lee California and Earthgrains acquisition of trademark licenses) - Additional Information (Detail) - USD ($)		3 Months Ended			4 Months Ended	12 Months Ended
	Feb. 23, 2013	Dec. 28, 2013	Oct. 05, 2013	Jul. 13, 2013	Apr. 19, 2014	Jan. 02, 2016	Dec. 28, 2013	Aug. 17, 2014
Business Acquisition [Line Items]
Bargain purchase gain							$ 50,071,000
Weighted average amortization years	21 years
Holdback	$ 10,000,000
Holdback amount available	$ 10,000,000
Maximum
Business Acquisition [Line Items]
Co-pack arrangement period	18 months
Sara Lee and Earthgrains acquisition of trademark licenses
Business Acquisition [Line Items]
Bargain purchase gain	$ 50,071,000		$ 1,200,000
Deferred income taxes, net	$ 31,345,000		800,000
Holdback								$ 7,600,000
Receipt from holdback					$ 7,500,000
Reduction in holdback		$ 100,000	0	$ 0
Final delivery date						Feb. 14, 2014
Sales related to acquisition							79,700,000
Acquisition-related costs							$ 1,500,000
Sara Lee and Earthgrains acquisition of trademark licenses | Distribution Rights
Business Acquisition [Line Items]
Change in fair value of spare parts			$ 2,000,000