Geographic Information And Significant Customers (Long-Lived Assets, Comprised Of Fixed Assets, Goodwill, Other Intangible Assets And Other Noncurrent Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 1,425,999	$ 1,078,762
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, domestic	1,368,836	1,021,501
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, domestic	$ 57,163	$ 57,261