Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)	6 Months Ended
	Jul. 01, 2011
Maximum payment under all contingent consideration arrangements	$ 15,100,000
Gain on foreign exchange associated with forward currency exchange	5,600,000
Maximum [Member]
Contingent consideration, discount rate	3.50%
Minimum [Member]
Contingent consideration, discount rate	0.10%
Deferred Compensation Plan Liabilities [Member] | Level I [Member]
Fair Value, Liabilities	10,724,000	[1]
Deferred Compensation Plan Liabilities [Member] | Level II [Member]
Fair Value, Liabilities	0	[1]
Deferred Compensation Plan Liabilities [Member] | Level III [Member]
Fair Value, Liabilities	0	[1]
Deferred Compensation Plan Liabilities [Member] | Total [Member]
Fair Value, Liabilities	10,724,000	[1]
Derivative Liabilities [Member] | Level I [Member]
Fair Value, Liabilities	0	[2]
Derivative Liabilities [Member] | Level II [Member]
Fair Value, Liabilities	226,000	[2]
Derivative Liabilities [Member] | Level III [Member]
Fair Value, Liabilities	0	[2]
Derivative Liabilities [Member] | Total [Member]
Fair Value, Liabilities	226,000	[2]
Contingent Consideration Liabilities [Member] | Level I [Member]
Fair Value, Liabilities	0	[3]
Contingent Consideration Liabilities [Member] | Level II [Member]
Fair Value, Liabilities	0	[3]
Contingent Consideration Liabilities [Member] | Level III [Member]
Fair Value, Liabilities	7,439,000	[3]
Contingent Consideration Liabilities [Member] | Total [Member]
Fair Value, Liabilities	7,439,000	[3]
Money Market Funds [Member] | Level I [Member]
Fair Value, Assets	76,484,000	[4]
Money Market Funds [Member] | Level II [Member]
Fair Value, Assets	0	[4]
Money Market Funds [Member] | Level III [Member]
Fair Value, Assets	0	[4]
Money Market Funds [Member] | Total [Member]
Fair Value, Assets	76,484,000	[4]
Deferred Compensation Plan Assets [Member] | Level I [Member]
Fair Value, Assets	10,634,000	[1]
Deferred Compensation Plan Assets [Member] | Level II [Member]
Fair Value, Assets	0	[1]
Deferred Compensation Plan Assets [Member] | Level III [Member]
Fair Value, Assets	0	[1]
Deferred Compensation Plan Assets [Member] | Total [Member]
Fair Value, Assets	10,634,000	[1]
Derivative Assets [Member] | Level I [Member]
Fair Value, Assets	0	[2]
Derivative Assets [Member] | Level II [Member]
Fair Value, Assets	6,177,000	[2]
Derivative Assets [Member] | Level III [Member]
Fair Value, Assets	0	[2]
Derivative Assets [Member] | Total [Member]
Fair Value, Assets	6,177,000	[2]
Level I [Member]
Fair Value, Assets	87,118,000
Fair Value, Liabilities	10,724,000
Level II [Member]
Fair Value, Assets	6,177,000
Fair Value, Liabilities	226,000
Level III [Member]
Fair Value, Assets	0
Fair Value, Liabilities	7,439,000
Total [Member]
Fair Value, Assets	93,295,000
Fair Value, Liabilities	18,389,000
Other Current Liabilities [Member]
Total contingent consideration liability	4,800,000
Other Non-Current Liabilities [Member]
Total contingent consideration liability	$ 2,600,000

[1] The Company maintains a self-directed, non-qualified deferred compensation plan for certain executives and other highly compensated employees. As of July 1, 2011 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.

[2] Derivative assets and liabilities included in Level II represent forward currency exchange contracts. The Company enters into these contracts to minimize the short-term impact of foreign currency fluctuations on certain trade and inter-company receivables and payables. During the second quarter of fiscal 2011 the Company entered into a forward currency exchange contract in anticipation of the foreign currency that was needed to pay for a business combination expected to close during the third quarter of fiscal 2011. A gain of $5.6 million on foreign exchange associated with this forward currency exchange contract was recognized and included in Foreign currency transaction gain (loss), net on the Company's Condensed Consolidated Statement of Income. 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.

[3] The Company has seven contingent consideration arrangements that require it to pay the former owners of certain companies it acquired during fiscal 2009 through fiscal 2011. The undiscounted maximum payment under all seven arrangements is $15.1 million, based on future revenues or gross margins over a 3 year period. The Company estimated the fair value of these liabilities using the expected cash flow approach with inputs being probability-weighted revenue or gross margin projections, as the case may be, and discount rates ranging from 0.10% to 3.50%. Of the total contingent consideration liability, $4.8 million and $2.6 million was included in Other current liabilities and Other non-current liabilities, respectively, on the Company's Condensed Consolidated Balance Sheets.

[4] These investments are highly liquid investments such as 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.