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Financial Instruments Measured at Fair Value (Detail) (USD $) In Thousands | Sep. 25, 2011 | Dec. 26, 2010
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Financial instrument assets | $ 40,539 |  | $ 42,878
Financial instrument liabilities | 17,842 |  |
Fair Value, Inputs, Level 1 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Financial instrument assets | 40,539 |  | 42,878
Fair Value, Inputs, Level 1 | Employee compensation related investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Financial instrument assets | 15,872 |  | 15,976
Fair Value, Inputs, Level 1 | Rabbi trust investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Financial instrument assets | 24,667 |  | 26,902
Fair Value, Inputs, Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Financial instrument liabilities | 17,842 |  |
Fair Value, Inputs, Level 3 | Contingent consideration payable |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Financial instrument liabilities | 17,842 | [1] |
Employee compensation related investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Financial instrument assets | 15,872 |  | 15,976
Rabbi trust investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Financial instrument assets | 24,667 |  | 26,902
Contingent consideration payable |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Financial instrument liabilities | $ 17,842 | [1] |
[1] | Under certain acquisition agreements entered into during 2011, the Company has agreed to pay the sellers earn-outs based on the financial performance of the businesses acquired. Contingent consideration payable in the table above represents the estimated fair value of future earn-outs payable under such agreements. The fair value of the contingent payments was measured based on the present value of the consideration expected to be transferred. The Company recognized a credit to expense of less than $1 million in its results for the thirteen and thirty-nine weeks ended September 25, 2011 related to the updating of the fair value measurement of its contingent considerations.

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- Definition Financial Instruments, Liabilities, Fair Value Disclosure + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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