Stock-Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Number of common stock reserved for issuance			3,200
Number of restricted stock awards granted			0
Number of options granted			76	40
Weighted-average grant-date fair value of options granted			$ 25.39	$ 19.10
Number of restricted stock units granted			196	89
Weighted-average grant-date fair value			$ 57.35	$ 46.94
Stock Options [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Recognized stock-based compensation costs	$ 443	$ 554	$ 1,452	$ 1,878
Recognized stock-based compensation costs, net of tax	281	351	920	1,190
Pre-tax unrecognized compensation expense for stock option granted, net of forfeitures	2,392		2,392
Recognized expense over a weighted-average period, years			1.6
Option award vesting period, minimum			three
Option awards contractual term, years			10
Option award vesting period, maximum			five
Restricted Stock Units [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Recognized stock-based compensation costs	1,628	1,132	6,608	3,208
Recognized stock-based compensation costs, net of tax	1,032	717	4,186	2,032
Pre-tax unrecognized compensation expense for stock option granted, net of forfeitures	$ 12,960		$ 12,960
Recognized expense over a weighted-average period, years			3.6
Option award vesting period, minimum			three
Option award vesting period, maximum			five

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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.

+ References

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The amount of expense, net of income tax, 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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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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The maximum vesting term over 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.

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The minimum vesting term over 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.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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