Multiemployer Pension And Postretirement Plans (Multiemplyer Pension Plans Trust Funds) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012		Dec. 31, 2011		Jan. 01, 2011
Multiemployer Plans [Line Items]
Multiemployer Plan, company contributions	$ 13.5		$ 12.6		$ 11.6
Bakery and Confectionary Union and Industry International Pension Fund [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	526118572	[1]
Multiemployer Plan Number	001	[1]
Multiemployer Plans, Certified Zone Status	Red	[1]	Green	[1]
Multiemployer Plans, Certified Zone Status Date	Dec. 31, 2012	[1]	Dec. 31, 2011	[1]
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan	Implemented	[1]
Multiemployer Plan, company contributions	4.8	[1]	4.3	[1]	3.8	[1]
Multiemployer Plans, Surcharge	Yes	[1]
Multiemployer Plans, collective bargaining arrangement first expiration date	May 05, 2013	[1]
Multiemployer Plans, collective bargaining arrangement last expiration date	Nov. 01, 2016	[1]
Multiemployer Plans, collective bargaining arrangement expiration date	May 05, 2013	[1]
Multiemployer Plans, percentage of employees covered by single collective bargaining arrangement	70.00%	[1]
Central States, Southeast and Southwest Areas Pension Fund [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	366044243	[2]
Multiemployer Plan Number	001	[2]
Multiemployer Plans, Certified Zone Status	Red	[2]	Red	[2]
Multiemployer Plans, Certified Zone Status Date	Dec. 31, 2012	[2]	Dec. 31, 2011	[2]
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan	Implemented	[2]
Multiemployer Plan, company contributions	4.3	[2]	4.1	[2]	3.6	[2]
Multiemployer Plans, Surcharge	Yes	[2]
Multiemployer Plans, collective bargaining arrangement first expiration date	Apr. 30, 2013	[2]
Multiemployer Plans, collective bargaining arrangement last expiration date	Oct. 20, 2015	[2]
Multiemployer Plans, collective bargaining arrangement expiration date	Jul. 27, 2014	[2]
Multiemployer Plans, percentage of employees covered by single collective bargaining arrangement	40.00%	[2]
Western Conference of Teamsters Pension Trust [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	916145047	[3]
Multiemployer Plan Number	001	[3]
Multiemployer Plans, Certified Zone Status	Green	[3]	Green	[3]
Multiemployer Plans, Certified Zone Status Date	Dec. 31, 2012	[3]	Dec. 31, 2011	[3]
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan	NA	[3]
Multiemployer Plan, company contributions	1.3	[3]	1.2	[3]	1.2	[3]
Multiemployer Plans, Surcharge	No	[3]
Multiemployer Plans, collective bargaining arrangement first expiration date	Mar. 29, 2013	[3]
Multiemployer Plans, collective bargaining arrangement last expiration date	Mar. 24, 2018	[3]
Multiemployer Plans, collective bargaining arrangement expiration date	Mar. 24, 2018	[3]
Multiemployer Plans, percentage of employees covered by single collective bargaining arrangement	40.00%	[3]
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, 2013		Jun. 30, 2012
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan	Implemented
Multiemployer Plan, company contributions	0.4		0.4		0.3
Multiemployer Plans, Surcharge	Yes
Multiemployer Plans, collective bargaining arrangement expiration date	Oct. 03, 2015
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	Red		Red
Multiemployer Plans, Certified Zone Status Date	Dec. 31, 2012		Dec. 31, 2011
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan	Implemented
Multiemployer Plan, company contributions	0.2		0.2		0.2
Multiemployer Plans, Surcharge	Yes
Multiemployer Plans, collective bargaining arrangement expiration date	May 31, 2015
Other Plans [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, company contributions	$ 2.5		$ 2.4		$ 2.5

[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 5/5/2013.

[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 7/27/2014.

[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.