Derivative Financial Instruments (Details) - Balance Sheet Location (USD $)			6 Months Ended				6 Months Ended
	Jul. 02, 2011	Jan. 01, 2011	Jul. 02, 2011 Maximum [Member] Diesel Fuel Swap [Member]	Jul. 02, 2011 Cash Flow Hedging [Member] Interest Rate Swap [Member]	Jul. 02, 2011 Interest Rate Contract [Member] Accounts Payable and Accrued Expenses [Member]	Jan. 01, 2011 Interest Rate Contract [Member] Accounts Payable and Accrued Expenses [Member]	Jul. 02, 2011 Diesel Fuel Swap [Member]	Jul. 02, 2011 Diesel Fuel Swap [Member] Accounts Payable and Accrued Expenses [Member]	Jan. 01, 2011 Diesel Fuel Swap [Member] Accounts Payable and Accrued Expenses [Member]	Jul. 02, 2011 Diesel Fuel Swap [Member] Prepaid Expenses and Other Current Assets [Member]	Jan. 01, 2011 Diesel Fuel Swap [Member] Prepaid Expenses and Other Current Assets [Member]
Notional Amount of Derivatives [Abstract]
Notional Amount of Derivatives				$ 50,000,000
Diesel Fuel Risk [Abstract]
Expected Hedging Percentage Of Diesel Fuel Requirements For Next Twelve Months							40.00%
Derivative Asset Forward Contract Expiration Period			12
Price Risk Cash Flow Hedges [Abstract]
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months							(100,000)
Derivative, Fair Value, Net [Abstract]
Derivative, Fair Value, Net	$ 122,000	$ (630,000)			$ 0	$ (907,000)		$ (274,000)	$ 0	$ 396,000	$ 277,000