Capital Stock (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 25, 2011	Dec. 26, 2010	Dec. 27, 2009
Capital Stock [Abstract]
Amount of common stock Board of Directors authorized to be repurchased after previous authorizations, maximum (in thousands of dollars)	$ 500,000
Number of previous authorizations of stock repurchases by the Board of Directors (in number of authorizations)	5
Cumulative authorized repurchase amount of the previous 5 authorizations	2,325,000
Number of shares repurchased (in shares)	10,461
Average price per share for the shares repurchased (in dollars per share)	$ 40.42
Total cost of these repurchases	423,008	636,681	90,994
Amount remaining under the authorization	$ 227,269