Fair Value Measurements (Assets And Liabilities Measured At Fair Value On Recurring Basis) (Detail) (USD $)	3 Months Ended	9 Months Ended		9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 28, 2012	Sep. 28, 2012 Month	Dec. 30, 2011	Sep. 28, 2012 Minimum	Dec. 30, 2011 Minimum	Sep. 28, 2012 Maximum	Dec. 30, 2011 Maximum	Sep. 28, 2012 Other Current Liabilities [Member]	Dec. 30, 2011 Other Current Liabilities [Member]	Sep. 28, 2012 Other Non Current Liability [Member]	Dec. 30, 2011 Other Non Current Liability [Member]	Sep. 28, 2012 Level I [Member]	Dec. 30, 2011 Level I [Member]	Sep. 28, 2012 Level I [Member] Money Market Funds [Member]		Dec. 30, 2011 Level I [Member] Money Market Funds [Member]		Sep. 28, 2012 Level I [Member] Deferred Compensation Plan Assets [Member]		Dec. 30, 2011 Level I [Member] Deferred Compensation Plan Assets [Member]		Sep. 28, 2012 Level II [Member]	Dec. 30, 2011 Level II [Member]	Sep. 28, 2012 Level II [Member] Derivative Financial Instruments, Assets [Member]	Dec. 30, 2011 Level II [Member] Derivative Financial Instruments, Assets [Member]	Sep. 28, 2012 Level III [Member]	Dec. 30, 2011 Level III [Member]	Sep. 28, 2012 Total [Member]	Dec. 30, 2011 Total [Member]	Sep. 28, 2012 Total [Member] Money Market Funds [Member]		Dec. 30, 2011 Total [Member] Money Market Funds [Member]		Sep. 28, 2012 Total [Member] Deferred Compensation Plan Assets [Member]		Dec. 30, 2011 Total [Member] Deferred Compensation Plan Assets [Member]		Sep. 28, 2012 Total [Member] Derivative Financial Instruments, Assets [Member]		Dec. 30, 2011 Total [Member] Derivative Financial Instruments, Assets [Member]		Sep. 28, 2012 Deferred Compensation Plan Liabilities [Member] Level I [Member]		Dec. 30, 2011 Deferred Compensation Plan Liabilities [Member] Level I [Member]		Sep. 28, 2012 Deferred Compensation Plan Liabilities [Member] Total [Member]		Dec. 30, 2011 Deferred Compensation Plan Liabilities [Member] Total [Member]		Sep. 28, 2012 Derivative Liabilities [Member] Level II [Member]	Dec. 30, 2011 Derivative Liabilities [Member] Level II [Member]	Sep. 28, 2012 Derivative Liabilities [Member] Total [Member]		Dec. 30, 2011 Derivative Liabilities [Member] Total [Member]		Sep. 28, 2012 Contingent Consideration Liabilities [Member] Level III [Member]		Dec. 30, 2011 Contingent Consideration Liabilities [Member] Level III [Member]		Sep. 28, 2012 Contingent Consideration Liabilities [Member] Total [Member]		Dec. 30, 2011 Contingent Consideration Liabilities [Member] Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value												$ 12,414,000	$ 10,537,000	$ 2,000	[1]	$ 3,000	[1]	$ 12,412,000	[2]	$ 10,534,000	[2]	$ 74,000	$ 351,000					$ 12,488,000	$ 10,888,000	$ 2,000	[1]	$ 3,000	[1]	$ 12,412,000	[2]	$ 10,534,000	[2]	$ 74,000	[3]	$ 351,000	[3]
Foreign Currency Contract, Asset, Fair Value Disclosure																								74,000	351,000
Maximum payment under all contingent consideration arrangements	7,100,000	7,100,000
Contingent consideration arrangements, months or years		19
Total contingent consideration liability			4,500,000					1,700,000	4,500,000	600,000	500,000
Contingent consideration, discount rate				0.0010	0.0006	0.025	0.035
Liabilities, Fair Value												12,412,000	10,534,000									461,000	1,968,000			2,245,000	4,967,000	15,118,000	17,469,000													12,412,000	[2]	10,534,000	[2]	12,412,000	[2]	10,534,000	[2]			461,000	[3]	1,968,000	[3]	2,245,000	[4]	4,967,000	[4]	2,245,000	[4]	4,967,000	[4]
Foreign Currency Derivative Liabilities at Fair Value																																																		461,000	1,968,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ 2,800,000

[1] These investments are highly liquid investments in money market funds. The fair values are determined using observable quoted prices in active markets. Money market funds are included in Cash and cash equivalents on the Company’s Condensed Consolidated Balance Sheets.

[2] The Company maintains a self-directed, non-qualified deferred compensation plan for certain executives and other highly compensated employees. The plan assets and liabilities are invested in actively traded mutual funds and individual stocks valued using observable quoted prices in active markets. Deferred compensation plan assets and liabilities are included in Other non-current assets and Other non-current liabilities on the Company’s Condensed Consolidated Balance Sheets.

[3] Derivative assets and liabilities included in Level II primarily represent forward currency exchange contracts. The Company typically enters into these contracts to minimize the short-term impact of foreign currency exchange rate fluctuations on certain trade and inter-company receivables and payables. The derivatives are not designated as hedging instruments. The fair values are determined using inputs based on observable quoted prices. Derivative assets and liabilities are included in Other current assets and Other current liabilities, respectively, on the Company’s Condensed Consolidated Balance Sheets.

[4] The Company has seven contingent consideration arrangements that require it to pay the former owners of certain companies it acquired. The undiscounted maximum payment under all seven arrangements as of the third quarter of fiscal 2012 is $7.1 million based on future revenues, gross margins or operating income over a 19 month period. The Company estimated the fair value of these liabilities using the expected cash flow approach with inputs being probability-weighted revenue, gross margin or operating income projections, as the case may be, and discount rates ranging from 0.10% to 2.5% for the third quarter of fiscal 2012 and 0.06% to 3.5% for fiscal year end 2011. As of the third quarter of fiscal 2012 and fiscal year end 2011, of the total contingent consideration liability, $1.7 million and $4.5 million was included in Other current liabilities, respectively, and $0.6 million and $0.5 million was included in Other non-current liabilities, respectively, on the Company’s Condensed Consolidated Balance Sheets