Fair Value Measurement - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Change in amount of contingent consideration	$ 18,200,000
Payments to partially offeset the increase in contingent consideration during period	7,800,000
Future funding commitments	40,000,000	33,000,000
Hedge funds redemption description	Shares in the hedge funds are generally redeemable twice a year or on the last business day of each quarter with at least 60 days written notice subject to potential 5% holdback. There are no unfunded commitments related to the hedge funds.
Hedge funds redemption period	at least 60 days
Hedge funds redemption potential holdback percentage	5.00%
Fair value of total long-term debt	1,600,000,000	1,900,000,000
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period of underlying assets of partnership investments, low estimate (in years)	12 years
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period of underlying assets of partnership investments, low estimate (in years)	10 years
Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	2.00%
Fair Value Inputs, Discount Rate	15.50%
Effect of 1% change in growth rate on valuation of goodwill, increase (decrease)	2,000,000
Effect Of One-Percent-Point Change In Discount Rate On Valuation Of Goodwill, Increase (Decrease)	$ 3,000,000
Fair Value, Inputs, Level 3 | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Discount Rate	29.00%
Fair Value, Inputs, Level 3 | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Discount Rate	10.00%