Derivatives (Details) (USD $)	3 Months Ended				9 Months Ended									3 Months Ended		9 Months Ended										3 Months Ended		9 Months Ended									9 Months Ended	1 Months Ended	3 Months Ended				9 Months Ended					3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended
	Sep. 28, 2013		Sep. 29, 2012		Sep. 28, 2013		Sep. 29, 2012		Dec. 29, 2012	Sep. 28, 2013 Designated as Hedging Instrument [Member]	Dec. 29, 2012 Designated as Hedging Instrument [Member]	Sep. 28, 2013 Not Designated as Hedging Instrument [Member]	Dec. 29, 2012 Not Designated as Hedging Instrument [Member]	Sep. 28, 2013 Natural Gas Swap [Member]	Sep. 29, 2012 Natural Gas Swap [Member]	Sep. 28, 2013 Natural Gas Swap [Member]	Sep. 29, 2012 Natural Gas Swap [Member]	Sep. 28, 2013 Natural Gas Swap [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Dec. 29, 2012 Natural Gas Swap [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Sep. 28, 2013 Natural Gas Swap [Member] Designated as Hedging Instrument [Member] Other Current Assets [Member]	Dec. 29, 2012 Natural Gas Swap [Member] Designated as Hedging Instrument [Member] Other Current Assets [Member]	Sep. 28, 2013 Heating Oil Swaps And Options [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Dec. 29, 2012 Heating Oil Swaps And Options [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Sep. 28, 2013 Heating Oil Swaps And Options [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member]	Dec. 29, 2012 Heating Oil Swaps And Options [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member]	Sep. 28, 2013 Corn Option [Member]	Sep. 29, 2012 Corn Option [Member]	Sep. 28, 2013 Corn Option [Member]	Sep. 29, 2012 Corn Option [Member]	Sep. 28, 2013 Corn Option [Member] Designated as Hedging Instrument [Member] Other Current Assets [Member]	Dec. 29, 2012 Corn Option [Member] Designated as Hedging Instrument [Member] Other Current Assets [Member]	Sep. 28, 2013 Corn Option [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Dec. 29, 2012 Corn Option [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Sep. 28, 2013 Corn options and futures [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member]	Dec. 29, 2012 Corn options and futures [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member]	Sep. 28, 2013 Forward Contracts [Member] Commodity Contract [Member]	Sep. 28, 2013 Cash Flow Hedging [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Interest Rate Swap [Member]	Sep. 28, 2013 Cash Flow Hedging [Member] Interest Rate Swap [Member]		Sep. 29, 2012 Cash Flow Hedging [Member] Interest Rate Swap [Member]		Sep. 28, 2013 Cash Flow Hedging [Member] Interest Rate Swap [Member]		Sep. 29, 2012 Cash Flow Hedging [Member] Interest Rate Swap [Member]		May 19, 2006 Cash Flow Hedging [Member] Interest Rate Swap [Member] derivative	Sep. 28, 2013 Cash Flow Hedging [Member] Natural Gas Swap [Member]		Sep. 29, 2012 Cash Flow Hedging [Member] Natural Gas Swap [Member]		Sep. 28, 2013 Cash Flow Hedging [Member] Natural Gas Swap [Member]		Sep. 29, 2012 Cash Flow Hedging [Member] Natural Gas Swap [Member]		Sep. 28, 2013 Cash Flow Hedging [Member] Corn Option [Member]		Sep. 29, 2012 Cash Flow Hedging [Member] Corn Option [Member]		Sep. 28, 2013 Cash Flow Hedging [Member] Corn Option [Member]		Sep. 29, 2012 Cash Flow Hedging [Member] Corn Option [Member]
Derivatives, Fair Value [Line Items]
Number of Interest Rate Derivatives Held																																															2
Payment for Cash Flow Hedge																																						$ 2,000,000
Amount reclassified from accumulated other comprehensive loss into earnings over next 12 months																																					2,900,000
Cash Flow Hedge Loss Reclassified to Earnings																																					0
Asset Derivatives Fair Value	3,283,000				3,283,000				722,000	3,136,000	501,000	147,000	221,000											147,000	104,000									0	117,000
Derivative Liability, Fair Value, Gross Liability	38,000				38,000				144,000	29,000	21,000	9,000	123,000					29,000	21,000	18,000	11,000	9,000	4,000							3,118,000	490,000	0	119,000
Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	2,662,000	[1]	(123,000)	[1]	5,790,000	[2]	(606,000)	[2]																															0	[1]	0	[1]	0	[2]	0	[2]		(14,000)	[1]	(123,000)	[1]	73,000	[2]	(606,000)	[2]	2,676,000	[1]	0	[1]	5,717,000	[2]	0	[2]
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2,060,000	[3]	(259,000)	[3]	3,155,000	[3]	(1,527,000)	[3]																															0	[3]	0	[3]	0	[3]	(260,000)	[3]		(95,000)	[3]	(259,000)	[3]	92,000	[3]	(1,267,000)	[3]	2,155,000	[3]	0	[3]	3,063,000	[3]	0	[3]
Gain Recognized in Income on Derivatives, Ineffective Portion and Amount Excluded from Effectiveness Testing	216,000	[4]	6,000	[4]	257,000	[4]	9,000	[4]																															0	[4]	0	[4]	0	[4]	0	[4]		1,000	[4]	5,000	[4]	8,000	[4]	8,000	[4]	215,000	[4]	1,000	[4]	249,000	[4]	1,000	[4]
Loss activity recognized in other comprehensive loss	(2,700,000)		(100,000)		(5,800,000)		(600,000)							14,000	123,000	(73,000)	606,000									(2,676,000)	0	(5,717,000)	0
Loss activity recognized in other comprehensive loss, tax	1,000,000		100,000		2,200,000		(200,000)							5,000	48,000	(28,000)	234,000									(1,031,000)	0	(2,209,000)	0
Forward Purchase Amount																																				$ 3,500,000

[1] Amount recognized in accumulated OCI (effective portion) is reported as accumulated other comprehensive income/(loss) of approximately $2.7 million and approximately $0.1 million recorded net of taxes of approximately $1.0 million and less than $0.1 million as of September 28, 2013 and September 29, 2012, respectively.

[2] Amount recognized in accumulated OCI (effective portion) is reported as accumulated other comprehensive income/(loss) of approximately $5.8 million and approximately $0.6 million recorded net of taxes of approximately $2.2 million and $0.2 million as of September 28, 2013 and September 29, 2012, respectively.

[3] Gains and (losses) reclassified from accumulated OCI into income (effective portion) for interest rate swaps is included in interest expense and corn options and natural gas swaps are included in cost of sales, respectively, in the Company’s consolidated statements of operations.

[4] Gains and (losses) recognized in income on derivatives (ineffective portion) for interest rate swaps, corn options and natural gas swaps is included in other income/(expense), net in the Company’s consolidated statements of operations.