Investments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Schedule of Equity Method Investments [Line Items]
Aggregate carrying value of equity investments	$ 123,000,000
Pretax earnings (losses) recorded for the investment under equity method	22,387,000	8,197,000	19,140,000
Dividends received from investees	36,000,000	53,000,000	45,000,000
Net equity income, impairment charges related to certain digital business investments	129,165,000	57,511,000	59,740,000
Advertising revenues	2,355,922,000	2,511,025,000	2,710,524,000
Digital
Schedule of Equity Method Investments [Line Items]
Pretax earnings (losses) recorded for the investment under equity method	(396,000)	(184,000)	(197,000)
Net equity income, impairment charges related to certain digital business investments	90,000,000		13,000,000
Publishing
Schedule of Equity Method Investments [Line Items]
Pretax earnings (losses) recorded for the investment under equity method	23,380,000	8,543,000	19,337,000
Net equity income, impairment charges related to certain digital business investments	32,000,000	27,000,000	36,000,000
Advertising revenues	161,000,000	154,000,000	142,000,000
Non-Operating Charges | Digital
Schedule of Equity Method Investments [Line Items]
Net equity income, impairment charges related to certain digital business investments	$ 7,000,000	$ 16,000,000	$ 3,000,000