Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended											12 Months Ended
	Dec. 28, 2013		Sep. 28, 2013		Jun. 29, 2013		Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013		Dec. 29, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Net sales	$ 428,749	[1]	$ 425,786	[1]	$ 423,593	[1]	$ 445,422	$ 424,915	$ 452,732	$ 436,674	$ 387,108	$ 1,723,550		$ 1,701,429		$ 1,797,249
Net income	22,493	[1]	27,651	[1]	26,418	[1]	32,405	28,802	37,172	36,225	28,571	108,967		130,770		169,418
Assets	3,244,133							1,552,416				3,244,133		1,552,416
Depreciation and amortization												98,787		85,371		78,909
Capital expenditures												118,307	[2]	115,413	[2]	60,153	[2]
Long-Lived Assets	2,116,630											2,116,630
Domestic
Segment Reporting Information [Line Items]
Net sales												1,683,078		1,687,004		1,769,765
CANADA
Segment Reporting Information [Line Items]
Net sales												32,397		0		0
Long-Lived Assets	625,797											625,797
UNITED STATES
Segment Reporting Information [Line Items]
Net sales												1,691,153
Long-Lived Assets	1,490,833											1,490,833
MEXICO
Segment Reporting Information [Line Items]
Net sales												8,075		14,425		27,484
Rendering [Member]
Segment Reporting Information [Line Items]
Net sales												1,457,609		1,406,061		1,501,280
Net income												244,482		267,511		329,791
Assets	1,884,010							1,107,052				1,884,010		1,107,052
Depreciation and amortization												80,482		66,964		66,412
Capital expenditures												75,612		70,873		51,888
Bakery [Member]
Segment Reporting Information [Line Items]
Net sales												265,941		295,368		295,969
Net income												41,214		57,126		62,259
Assets	167,161							170,566				167,161		170,566
Depreciation and amortization												10,486		10,711		8,647
Capital expenditures												9,166		13,537		6,247
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Net income												(138,621)		(169,813)		(185,469)
Assets	1,192,962							274,798				1,192,962		274,798
Depreciation and amortization												7,819		7,696		3,850
Capital expenditures												33,529		31,003		2,018
Interest Expense [Member]
Segment Reporting Information [Line Items]
Net income												$ (38,108)		$ (24,054)		$ (37,163)

[1] Included in net income are $0.8 million in transaction costs in the second quarter of fiscal 2013, $8.3 million in transaction costs in the third quarter of fiscal 2013 and $14.2 million in the fourth quarter relating to the Terra Transaction, Rothsay Acquisition and the VION Acquisition.

[2] Excludes the capital assets acquired as part of the acquisition of assets related to the Terra Transaction and the Rothsay Acquisition in fiscal 2013 of approximately $167.0 million and the BioPur acquisition in fiscal 2012 of approximately $0.6 million