Multipemployer Pension and Postretirement Plans Multiemployer Pension Plans Trusts Funds (Details) - USD ($) $ in Millions		12 Months Ended
		Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Multiemployer Plans [Line Items]
Multiemployer Plan, Period Contributions		$ 14.7	$ 14.7	$ 14.5
Bakery And Confectionary Union And Industry International Pension Fund [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Employer's Participants		70.00%
Entity Tax Identification Number	[1]	526118572
Multiemployer Plan Number	[1]	001
Multiemployer Plans, Certified Zone Status	[1]	Red	Red
Multiemployer Plans, Certified Zone Status, Date	[1]	Dec. 31, 2015	Dec. 31, 2014
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date, First	[1]	Jul. 31, 2016
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date, Last	[1]	Oct. 31, 2017
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date	[1]	Apr. 30, 2017
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan	[1]	Implemented
Multiemployer Plan, Period Contributions	[1]	$ 5.1	$ 5.4	5.2
Multiemployer Plans, Surcharge	[1]	Yes
Central States Southeast And Southwest Areas Pension Fund [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Employer's Participants		40.00%
Entity Tax Identification Number	[2]	366044243
Multiemployer Plan Number	[2]	001
Multiemployer Plans, Certified Zone Status	[2]	Red	Red
Multiemployer Plans, Certified Zone Status, Date	[2]	Dec. 31, 2015	Dec. 31, 2014
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date, First	[2]	Apr. 30, 2016
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date, Last	[2]	Jul. 31, 2019
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date	[2]	Sep. 30, 2018
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan	[3]	Implemented
Multiemployer Plan, Period Contributions	[3]	$ 4.8	$ 4.5	4.5
Multiemployer Plans, Surcharge	[3]	Yes
Western Conference Of Teamsters Pension Trust [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Employer's Participants		40.00%
Entity Tax Identification Number	[3]	916145047
Multiemployer Plan Number	[3]	001
Multiemployer Plans, Certified Zone Status	[3]	Green	Green
Multiemployer Plans, Certified Zone Status, Date	[3]	Dec. 31, 2015	Dec. 31, 2014
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date, First	[3]	Jan. 31, 2018
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date, Last	[3]	Oct. 31, 2018
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date	[3]	Mar. 24, 2018
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan	[3]	NA
Multiemployer Plan, Period Contributions	[3]	$ 1.6	$ 1.6	1.5
Multiemployer Plans, Surcharge	[3]	No
Hagerstown Motor Carriers And Teamsters Pension Fund [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number		526045424
Multiemployer Plan Number		001
Multiemployer Plans, Certified Zone Status		Red	Red
Multiemployer Plans, Certified Zone Status, Date		Jun. 30, 2016	Jun. 30, 2015
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date		Sep. 28, 2019
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan		Implemented
Multiemployer Plan, Period Contributions		$ 0.5	$ 0.5	0.5
Multiemployer Plans, Surcharge		No
Local 734 Pension Plan [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number		516040136
Multiemployer Plan Number		001
Multiemployer Plans, Certified Zone Status		Red	Red
Multiemployer Plans, Certified Zone Status, Date		Apr. 30, 2016	Apr. 30, 2015
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date		Apr. 01, 2019
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan		Implemented
Multiemployer Plan, Period Contributions		$ 0.3	$ 0.3	0.3
Multiemployer Plans, Surcharge		Yes
Twin Cities Bakery Drivers Pension Plan [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number		416172265
Multiemployer Plan Number		001
Multiemployer Plans, Certified Zone Status		Green	Green
Multiemployer Plans, Certified Zone Status, Date		Dec. 31, 2015	Dec. 31, 2014
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date		May 31, 2018
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan		NA
Multiemployer Plan, Period Contributions		$ 0.2	$ 0.2	0.2
Multiemployer Plans, Surcharge		Yes
Upstate New York Bakery Drivers And Industry Pension Fund [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number		150612437
Multiemployer Plan Number		001
Multiemployer Plans, Certified Zone Status		Green	Green
Multiemployer Plans, Certified Zone Status, Date		Jun. 30, 2015	Jun. 30, 2014
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date		Sep. 10, 2017
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan		NA
Multiemployer Plan, Period Contributions		$ 0.2	$ 0.2	0.1
Multiemployer Plans, Surcharge		No
Other Plans [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, Period Contributions		$ 2.0	$ 2.0	$ 2.2

[1] The Company is party to multiple CBAs requiring contributions to this fund, each with its own expiration date. Over 70 percent of the Company’s participants in this fund are covered by a single CBA that expires on 4/30/2017.

[2] The Company is party to multiple CBAs requiring contributions to this fund, each with its own expiration date. Over 40 percent of the Company’s participants in this fund are covered by a single CBA that expires on 9/30/2018.

[3] The Company is party to multiple CBAs requiring contributions to this fund, each with its own expiration date. Over 40 percent of the Company’s participants in this fund are covered by a single CBA that expires on 3/24/2018.