Long-Term Debt (Narrative) (Details) (USD $)	12 Months Ended		0 Months Ended	12 Months Ended					12 Months Ended					0 Months Ended			12 Months Ended			12 Months Ended
	Dec. 30, 2011	Dec. 31, 2010	May 06, 2011 2011 Credit Facility [Member] years	Dec. 30, 2011 2011 Credit Facility [Member]	Sep. 30, 2011 2011 Credit Facility [Member]	Dec. 30, 2011 Term Loan [Member]	Sep. 30, 2011 Term Loan [Member]	May 06, 2011 Term Loan [Member]	Dec. 30, 2011 Revolving Credit Facility [Member]	May 06, 2011 Revolving Credit Facility [Member]	Dec. 31, 2010 Revolving Credit Facility [Member]	Dec. 30, 2011 Promissory Notes And Other [Member]	Dec. 31, 2010 Promissory Notes And Other [Member]	Jul. 14, 2011 2011 Uncommitted Facility [Member]	Dec. 30, 2011 2011 Uncommitted Facility [Member]	Sep. 30, 2011 2011 Uncommitted Facility [Member]	Dec. 30, 2011 Minimum [Member]	Dec. 30, 2011 Minimum [Member] Floating Per Annum Rate [Member]	Dec. 30, 2011 Minimum [Member] Reserve-Adjusted Fixed Per Annum Rate [Member]	Dec. 30, 2011 Maximum [Member]	Dec. 30, 2011 Maximum [Member] 2011 Credit Facility [Member]	Dec. 30, 2011 Maximum [Member] Floating Per Annum Rate [Member]	Dec. 30, 2011 Maximum [Member] Reserve-Adjusted Fixed Per Annum Rate [Member]
Debt Instrument [Line Items]
Unsecured credit facility, aggregate principal amount			$ 1,100,000,000
Credit facility term period, years			5
Term loan credit facility maximum borrowing amount								400,000,000		700,000,000
Unsecured revolving credit facility, additional borrowing capacity			300,000,000
Uncommitted revolving loan facility														50,000,000
Credit facility interest rate in addition to specific base rates															1.00%			0.25%	1.25%			1.25%	2.25%
Total debt	564,436,000	153,153,000			133,300,000	385,000,000	385,000,000		177,300,000		151,000,000	2,136,000	2,153,000			44,000,000
Non-current portion of long-term debt	498,518,000	151,160,000				365,000,000			133,300,000
Unsecured revolving credit facility, initiation date			May 6, 2011
Unsecured revolving credit facility, expiration date									May 6, 2016
Term loan credit facility term period, years			5
Credit facility commitment fee, percentage																	0.20%			0.40%
Amortization of credit facility, percentage, year one				5.00%
Amortization of credit facility, percentage, year two				5.00%
Amortization of credit facility, percentage, year three				10.00%
Amortization of credit facility, percentage, year four				10.00%
Amortization of credit facility, percentage, year five				70.00%
Maximum leverage and minimum interest coverage ratio																					3.5
Debt instrument, face amount												2,100,000	2,200,000
Outstanding notes payable												$ 1,700,000	$ 1,900,000
Interest rate on notes												6.00%
Callable notfication, months	6
Interest paid on borrowings bearing interest at a fixed rate, months	3