Derivatives (Details) (USD $)	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. 29, 2012		Oct. 01, 2011		Sep. 29, 2012		Oct. 01, 2011		Dec. 31, 2011	Sep. 29, 2012 Designated as Hedging Instrument [Member]	Dec. 31, 2011 Designated as Hedging Instrument [Member]	Jan. 01, 2011 Designated as Hedging Instrument [Member]	Sep. 29, 2012 Not Designated as Hedging Instrument [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member]	Sep. 29, 2012 Natural Gas Swap [Member]	Oct. 01, 2011 Natural Gas Swap [Member]	Sep. 29, 2012 Natural Gas Swap [Member]	Oct. 01, 2011 Natural Gas Swap [Member]	Sep. 29, 2012 Natural Gas Swap [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Dec. 31, 2011 Natural Gas Swap [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Sep. 29, 2012 Natural Gas Swap [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Dec. 31, 2011 Natural Gas Swap [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Sep. 29, 2012 Heating Oil Swaps And Options [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member]	Dec. 31, 2011 Heating Oil Swaps And Options [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member]	Sep. 29, 2012 Heating Oil Swaps [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Dec. 31, 2011 Heating Oil Swaps [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Sep. 29, 2012 Corn Option [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Dec. 31, 2011 Corn Option [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Sep. 29, 2012 Corn Option [Member] Designated as Hedging Instrument [Member] Other Current Assets [Member]	Dec. 31, 2011 Corn Option [Member] Designated as Hedging Instrument [Member] Other Current Assets [Member]	Sep. 29, 2012 Corn Option [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Dec. 31, 2011 Corn Option [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member]	Sep. 29, 2012 Forward Contracts [Member] Commodity Contract [Member]	Sep. 29, 2012 Cash Flow Hedging [Member]	Dec. 31, 2010 Cash Flow Hedging [Member] Interest Rate Swap [Member]	Sep. 29, 2012 Cash Flow Hedging [Member] Interest Rate Swap [Member]		Oct. 01, 2011 Cash Flow Hedging [Member] Interest Rate Swap [Member]		Sep. 29, 2012 Cash Flow Hedging [Member] Interest Rate Swap [Member]		Oct. 01, 2011 Cash Flow Hedging [Member] Interest Rate Swap [Member]		May 19, 2006 Cash Flow Hedging [Member] Interest Rate Swap [Member] derivative	Sep. 29, 2012 Cash Flow Hedging [Member] Natural Gas Swap [Member]		Oct. 01, 2011 Cash Flow Hedging [Member] Natural Gas Swap [Member]		Sep. 29, 2012 Cash Flow Hedging [Member] Natural Gas Swap [Member]		Oct. 01, 2011 Cash Flow Hedging [Member] Natural Gas Swap [Member]		Sep. 29, 2012 Cash Flow Hedging [Member] Corn Option [Member]		Oct. 01, 2011 Cash Flow Hedging [Member] Corn Option [Member]		Sep. 29, 2012 Cash Flow Hedging [Member] Corn Option [Member]		Oct. 01, 2011 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																																		0
Cash Flow Hedge Loss Reclassified to Earnings																																		300,000
Asset Derivatives Fair Value	382,000				382,000				6,000	13,000		0	369,000	6,000									369,000	6,000
Derivative Liability, Fair Value, Gross Liability	690,000				690,000				836,000	7,000	669,000		683,000	167,000					0	669,000	0	143,000			0	24,000	7,000	0	13,000	0	683,000	0
Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(123,000)	[1]	(278,000)	[1]	(606,000)	[2]	(509,000)	[2]																												0	[1]	0	[1]	0	[2]	0	[2]		(123,000)	[1]	(278,000)	[1]	(606,000)	[2]	(509,000)	[2]	0	[1]	0	[1]	0	[2]	0	[2]
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(259,000)	[3]	(388,000)	[3]	(1,527,000)	[3]	(1,055,000)	[3]																												0	[3]	(285,000)	[3]	(260,000)	[3]	(907,000)	[3]		(259,000)	[3]	(103,000)	[3]	(1,267,000)	[3]	(148,000)	[3]	0	[3]	0	[3]	0	[3]	0	[3]
Gain Recognized in Income on Derivatives, Ineffective Portion and Amount Excluded from Effectiveness Testing	6,000	[4]	(1,000)	[4]	9,000	[4]	(2,000)	[4]																												0	[4]	0	[4]	0	[3]	0	[3]		5,000	[4]	(1,000)	[4]	8,000	[3]	(2,000)	[3]	1,000	[4]	0	[4]	1,000	[3]	0	[3]
Loss activity recognized in other comprehensive loss	100,000		(300,000)		600,000		(500,000)								123,000	278,000	606,000	509,000
Loss activity recognized in other comprehensive loss, tax	100,000		100,000		200,000		200,000								48,000	107,000	234,000	196,000
Forward Purchase Amount																																	$ 4,400,000

[1] Amount recognized in accumulated OCI (effective portion) is reported as accumulated other comprehensive income/(loss) of approximately $0.1 million and approximately $0.3 million recorded net of taxes of approximately less than $0.1 million and $0.1 million as of September 29, 2012 and October 1, 2011, respectively.

[2] Amount recognized in accumulated OCI (effective portion) is reported as accumulated other comprehensive income/(loss) of approximately $0.6 million and approximately $0.5 million recorded net of taxes of approximately $0.2 million and approximately $0.2 million as of September 29, 2012 and October 1, 2011, respectively.

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