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Stock-Based Compensation Expense (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jul. 01, 2012 OptionPlan EmployeeGroup	Jul. 03, 2011	Jul. 01, 2012 OptionPlan EmployeeGroup	Jul. 03, 2011	Dec. 31, 2011
Stock-Based Compensation Expense (Textual) [Abstract]
Shares available for grant under stock option plans	6,319,161		6,319,161
Stock Based Compensation Expense (Additional Textual) [Abstract]
Number of stock option plans	2		2
Weighted-average grant-date fair values of stock options granted	$ 13.50	$ 11.95	$ 13.35	$ 11.77
Number of groups within the employee population	2		2
Percentage of stock options granted to senior management expected to vest	67.00%		67.00%
Percentage of stock options granted to all other employees expected to vest	66.00%		66.00%
Estimated forfeiture rate for unvested options for senior management	12.00%		12.00%
Estimated forfeiture rate for unvested options for all non-senior management	14.00%		14.00%
Stock-based compensation expense	$ 1,989,000	$ 1,957,000	$ 5,303,000	$ 4,309,000
Income tax benefit recognized related to stock-based compensation expense	646,000	654,000	1,733,000	1,445,000
Compensation expense capitalized	0		0		0
Total intrinsic values of stock options exercised	672,000	7,969,000	13,308,000	12,637,000
Total unrecognized compensation expense related to non-vested stock options	$ 9,803,000		$ 9,803,000
Weighted-average period for unrecognized compensation expense related to non-vested stock options (years)	1 year 8 months 12 days
General Stock Option Plan [Member]
Stock-Based Compensation Expense (Textual) [Abstract]
Shares available for grant under stock option plans	4,953,176		4,953,176
Expiration period of stock option plan	10 years
Vesting period for stock option plans	4 years
Stock Option and Incentive Plan [Member]
Stock-Based Compensation Expense (Textual) [Abstract]
Shares available for grant under stock option plans	1,365,985		1,365,985
Expiration period of stock option plan	10 years
Vesting period for stock option plans	4 years

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Shares based compensation arrangement by shares based payment award options exercisable intrinsic value.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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