Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Deferred tax assets:
Loss contingency reserves	$ 10,756	$ 10,399
Employee benefits	9,749	8,700
Pension liability	4,183	12,132
Intangible assets amortization, including taxable goodwill	7,040	1,981
Net Operating Losses	4,732	1,925
Investment in DGD Joint Venture	0	1,134
Other	9,306	7,733
Total gross deferred tax assets	45,766	44,004
Less valuation allowance	(871)	(300)
Net deferred tax assets	44,895	43,704
Deferred tax liabilities:
Intangible assets amortization, including taxable goodwill	63,779	22,083
Property, plant and equipment depreciation	67,535	53,772
Investment in DGD Joint Venture	(31,842)	0
Other	3,209	1,855
Total gross deferred tax liabilities	166,365	77,710
Net deferred tax liability	(121,470)	(34,006)
Current deferred tax asset	17,289	12,609
Non-current deferred tax liability	$ (138,759)	$ (46,615)