Long-Term Debt (Schedule Of Debt Outstanding) (Details) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Total debt	$ 535,049,000	$ 258,195,000
Less current portion of long-term debt	(20,462,000)	(4,256,000)
Total long-term debt	514,587,000	253,939,000
Unsecured U.S. Term Loan Due September 2016 [Member]
Debt Instrument [Line Items]
Interest rate	1.91%
Interest rate period	30-day Eurodollar rate
Interest rate, start range	1.00%
Interest rate, end range	1.70%
Debt expiration date	Sep. 30, 2016
Unsecured debt	325,000,000	0
Unsecured U.S. Dollar-Denominated Revolving Credit Facility Due December 7, 2015 [Member]
Debt Instrument [Line Items]
Interest rate	1.63%
Interest rate period	30-day Eurodollar rate
Debt expiration date	Dec. 07, 2015
Unsecured debt	100,000,000	145,000,000
Private Placement Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes	100,000,000
Interest payable based on fixed rate	5.72%
Debt expiration date	Jun. 01, 2017
Debt instrument fair value adjustment	4,700,000
Senior notes	104,664,000	105,705,000
Secured Bank Loan Due October 2015 [Member]
Debt Instrument [Line Items]
Interest rate	0.56%
Interest rate period	1-month LIBOR
Debt expiration date	Oct. 01, 2015
Secured debt	3,341,000	4,416,000
Secured Bank Loan Due November 2013 [Member]
Debt Instrument [Line Items]
Interest rate	1.06%
Interest rate period	1-month LIBOR
Debt expiration date	Nov. 01, 2013
Secured debt	917,000	1,917,000
Revolving Equipment Credit Facility Due May, 2013 [Member]
Debt Instrument [Line Items]
Interest rate	2.21%
Interest rate period	LIBOR
Debt expiration date	May 01, 2013
Total debt	1,127,000	968,000
Various Unsecured Loans Due From 2012 [Member]
Debt Instrument [Line Items]
Interest rate, start range	5.13%
Interest rate, end range	8.00%
Debt expiration date, start range	Dec. 31, 2012
Unsecured debt	0	159,000
Other Debt [Member]
Debt Instrument [Line Items]
Other debt	$ 0	$ 30,000
LIBOR [Member] | Secured Bank Loan Due October 2015 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.35%
LIBOR [Member] | Secured Bank Loan Due November 2013 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.85%
LIBOR [Member] | Revolving Equipment Credit Facility Due May, 2013 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Eurodollar Rate [Member] | Unsecured U.S. Term Loan Due September 2016 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.70%
Eurodollar Rate [Member] | Unsecured U.S. Dollar-Denominated Revolving Credit Facility Due December 7, 2015 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.30%