Derivatives (Details) (USD $)	3 Months Ended				6 Months Ended
	Jul. 02, 2011		Jul. 03, 2010		Jul. 02, 2011		Jul. 03, 2010		Jan. 01, 2011
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 203,000				$ 203,000				$ 16,000
Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	18,000	[1]	(46,000)	[1]	231,000	[2]	(449,000)	[2]
Asset Derivatives Fair Value	88,000				88,000				428,000
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(198,000)	[3]	(380,000)	[3]	(667,000)	[3]	(579,000)	[3]
Gain Recognized in Income on Derivatives, Ineffective Portion and Amount Excluded from Effectiveness Testing	(9,000)	[4]	116,000	[4]	(1,000)	[4]	113,000	[4]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax					200,000		(400,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect					100,000		(200,000)
Cash Flow Hedging [Member] | Swap [Member] | Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	18,000	[1]	150,000	[1]	231,000	[2]	67,000	[2]
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	105,000	[3]	27,000	[3]	(45,000)	[3]	248,000	[3]
Gain Recognized in Income on Derivatives, Ineffective Portion and Amount Excluded from Effectiveness Testing	(9,000)	[4]	92,000	[4]	(1,000)	[4]	87,000	[4]
Cash Flow Hedging [Member] | Interest Rate and Natural Gas Swap [Member]
Derivatives, Fair Value [Line Items]
Amount reclassified from accumulated other comprehensive loss into earnings over next 12 months					900,000
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	0	[1]	(196,000)	[1]	0	[2]	(516,000)	[2]
Payment for Cash Flow Hedge					2,000,000
Cash Flow Hedge Loss Reclassified to Earnings					600,000
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(303,000)	[3]	(407,000)	[3]	(622,000)	[3]	(827,000)	[3]
Gain Recognized in Income on Derivatives, Ineffective Portion and Amount Excluded from Effectiveness Testing	0	[4]	24,000	[4]	0	[4]	26,000	[4]
Cash Flow Hedging [Member] | Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Number of months cash flow hedge gain (loss) reclassified over					12
Forward Contracts [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Forward Purchase Amount	4,700,000				4,700,000
Swap [Member] | Natural Gas [Member] | Designated as Hedging Instrument [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	13,000				13,000				0
Swap [Member] | Natural Gas [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	27,000				27,000				212,000
Swap [Member] | Natural Gas [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	77,000				77,000				16,000
Swap [Member] | Natural Gas [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	10,000				10,000				135,000
Swap [Member] | Heating Oil [Member] | Designated as Hedging Instrument [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	113,000				113,000				0
Swap [Member] | Heating Oil [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	51,000				51,000				81,000
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	77,000				77,000				16,000
Asset Derivatives Fair Value	10,000				10,000				135,000
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	126,000				126,000				0
Asset Derivatives Fair Value	78,000				78,000				293,000
Maximum [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	100,000		100,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	$ 100,000		$ 100,000

[1] (a)Amount recognized in accumulated OCI (effective portion) is reported as accumulated other comprehensive gain/(loss) of less than $0.1 million recorded net of taxes of less than $0.1 million as of July 2, 2011 and July 3, 2010, respectively.

[2] (a)Amount recognized in accumulated OCI (effective portion) is reported as accumulated other comprehensive gain/(loss) of approximately $0.2 million and approximately $0.4 million recorded net of taxes of approximately $0.1 million and $0.2 million as of July 2, 2011 and July 3, 2010, respectively.

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