Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended
	Apr. 01, 2012 Y OptionPlan EmployeeGroup	Apr. 03, 2011	Dec. 31, 2011
Stock-Based Compensation Expense (Textual) [Abstract]
Shares available for grant under stock option plans	6,294,849
Number of stock option plans	2
Weighted-average grant-date fair values of stock options granted	$ 12.98	$ 11.75
Number of groups within the employee population	2
Percentage of stock options granted to senior management expected to vest	67.00%
Percentage of stock options granted to all other employees expected to vest	66.00%
Estimated forfeiture rate for unvested options for senior management	12.00%
Estimated forfeiture rate for unvested options for all non-senior management	14.00%
Income tax benefit recognized related to stock-based compensation expense	$ 1,087,000	$ 791,000
Compensation expense capitalized	0		0
Total intrinsic values of stock options exercised	12,636,000	4,668,000
Total unrecognized compensation expense related to non-vested stock options	11,483,000
Weighted-average period for unrecognized compensation expense related to non-vested stock options (years)	1.8
Total fair values of stock options vested	6,399,000	7,002,000
Stock-based compensation expense	$ 3,314,000	$ 2,352,000
General Stock Option Plan [Member]
Stock-Based Compensation Expense (Textual) [Abstract]
Shares available for grant under stock option plans	4,928,864
Expiration period of stock option plans	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
Expiration period of stock option plans	10 years
Vesting period for stock option plans	4 years