Financial Instruments Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 25, 2012		Dec. 25, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Employee compensation related investments	$ 19,341		$ 17,224
Rabbi trust investments	28,299		26,162
Total assets	47,640		43,386
Contingent consideration payable	9,745	[1]	15,808	[1]
Total liabilities	9,745		15,808
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Employee compensation related investments	19,341		17,224
Rabbi trust investments	28,299		26,162
Total assets	47,640		43,386
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration payable	9,745	[1]	15,808	[1]
Total liabilities	$ 9,745		$ 15,808

[1] Under certain acquisition agreements entered into during fiscal 2011, the Company has agreed to pay the sellers earn-outs based on the financial performance of the acquired businesses. 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. For the thirteen weeks ended March 25, 2012, the contingent consideration was reduced by payments of $7.8 million partially offset by interest accretion and adjustments to fair value.