Subsequent Events (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended				0 Months Ended		3 Months Ended	0 Months Ended		1 Months Ended
	Sep. 23, 2012	Sep. 25, 2011	Sep. 23, 2012 About Group [Member]	Sep. 25, 2011 About Group [Member]	Sep. 26, 2012 Notes Due 2012 [Member]	Sep. 23, 2012 Notes Due 2012 [Member]	Dec. 30, 2012 Subsequent Event [Member]	Sep. 25, 2012 Subsequent Event [Member] About Group [Member]	Sep. 26, 2012 Subsequent Event [Member] Notes Due 2012 [Member]	Oct. 28, 2012 Subsequent Event [Member] Indeed.com [Member] Cost-method Investments [Member]
Subsequent Event [Line Items]
Proceeds from sale of cost method investments										$ 167,000
After-tax proceeds and gain from sale										100,000
Extinguishment of debt of 4.610% Notes					75,000				75,000
Interest rate on debt						4.61%			4.61%
Proceeds from sale of discontinued operation	140,044	0						300,000
Net working capital adjustment								16,000
Net after-tax proceeds from the sale, including a tax benefit								290,000
Gain on sale, net of income taxes	25,731	0	0	0				68,000
Immediate pension benefit offer, estimated acceptance rate							50.00%
Immediate pension benefit offer, non-cash settlement amount							$ 45,000