Debt, Commitments And Contingencies (Narrative) (Detail) (USD $)	9 Months Ended					9 Months Ended			9 Months Ended			9 Months Ended		9 Months Ended			1 Months Ended
	Sep. 28, 2012	Dec. 30, 2011	Jul. 08, 2011	Sep. 28, 2012 Notes Payable, Other Payables	Dec. 30, 2011 Notes Payable, Other Payables	Sep. 28, 2012 Minimum	Sep. 28, 2012 Minimum Base Rate Plus [Member]	Sep. 28, 2012 Minimum Reserve-Adjusted Rate [Member]	Sep. 28, 2012 Maximum	Sep. 28, 2012 Maximum Base Rate Plus [Member]	Sep. 28, 2012 Maximum Reserve-Adjusted Rate [Member]	Sep. 28, 2012 2011 Credit Facility [Member]	May 06, 2011 2011 Credit Facility [Member]	Sep. 28, 2012 Term Loan [Member]	Dec. 30, 2011 Term Loan [Member]	May 06, 2011 Term Loan [Member]	Jul. 14, 2011 Uncommitted Facility [Member]	Sep. 28, 2012 Uncommitted Facility [Member]	Jan. 27, 2012 Uncommitted Facility [Member]	Sep. 28, 2012 Revolving Credit Facility [Member]	Dec. 30, 2011 Revolving Credit Facility [Member]	May 06, 2011 Revolving Credit Facility [Member]	Sep. 28, 2012 Promissory Notes And Other Debt [Member]	Dec. 30, 2011 Promissory Notes And Other Debt [Member]	Sep. 28, 2012 Promissory Notes And Other Debt [Member] Minimum	Sep. 28, 2012 Promissory Notes And Other Debt [Member] Maximum	Sep. 28, 2012 Long-term Debt	Dec. 30, 2011 Long-term Debt
Debt Instrument [Line Items]
Aggregate availability of revolving credit line													$ 1,100,000,000			$ 400,000,000						$ 700,000,000
Increase in available revolving credit line													300,000,000						75,000,000
Unsecured revolving credit facility, initiation date														May 06, 2011
Line of credit facility uncommitted fee amount																	50,000,000
Credit facility interest rate in addition to specific base rates							0.25%	1.25%		1.25%	2.25%							1.00%
Total debt	643,107,000	564,436,000										213,000,000		370,000,000	385,000,000			57,000,000		270,000,000	177,300,000		3,107,000	2,136,000
Non-current portion of long-term debt	553,198,000	498,518,000												340,000,000						213,000,000							200,000	200,000
Credit facility commitment fee, percentage						0.20%			0.40%
Amortization of credit facility percentage year one												5.00%
Amortization of credit facility percentage year two												5.00%
Amortization of credit facility percentage year three												10.00%
Amortization of credit facility percentage year four												10.00%
Amortization of credit facility percentage year five												70.00%
Unsecured revolving credit facility, expiration date														May 06, 2016
Maximum leverage and minimum interest coverage ratio												3.5
Ratio of total indebtedness to EBITDA	The Company must also maintain, at the end of each fiscal quarter, a ratio of (a) EBITDA (as defined in the 2011 Credit Facility) to (b) interest expenses for the most recently ended period of four fiscal quarters of not less than 3.5 to 1. The Company must also maintain, at the end of each fiscal quarter, a ratio of (x) total indebtedness to (y) EBITDA (as defined in the 2011 Credit Facility) for the most recently ended period of four fiscal quarters of not greater than 3 to 1; provided, that on the completion of a material acquisition, the Company may increase the ratio by 0.25 for the fiscal quarter during which such acquisition occurred and each of the three subsequent fiscal quarters. The Company was in compliance with these restrictive covenants as of the third quarter of fiscal 2012. The 2011 Credit Facility contains events of default that include, among others, non-payment of principal, interest or fees, breach of covenants, inaccuracy of representations and warranties, cross defaults to certain other indebtedness, bankruptcy and insolvency events, material judgments and events constituting a change of control. Upon the occurrence and during the continuance of an event of default, interest on the obligations will accrue at an increased rate and the lenders may accelerate the Company’s obligations under the 2011 Credit Facility, however that acceleration will be automatic in the case of bankruptcy and insolvency events of default.
Restrictive covenants	The Company was in compliance with these restrictive covenants as of the third quarter of fiscal 2012
Increase in leverage ratio	0.25%
Total debt																							3,100,000	2,100,000
Outstanding notes payable				2,500,000	2,000,000
Acquisition-related earn-outs as current liabilities	2,300,000
Acquisition-related holdbacks as non-current liabilities	5,300,000		1,307,000
Additional potential earn-out cash payments	4,800,000
Unconditional purchase obligations	$ 82,700,000
Debt Instrument, Interest Rate, Stated Percentage																									2.50%	3.30%