Stock-Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 01, 2012 Y	Apr. 03, 2011 Y
Stock option activity
Outstanding as of December 31, 2011, Shares	4,473
Outstanding as of December 31, 2011, Weighted-Average Exercise Price	$ 24.48
Granted, Shares	5
Granted, Weighted-Average Exercise Price	$ 44.75
Exercised, Shares	(614)
Exercised, Weighted-Average Exercise Price	$ 21.46
Forfeited or expired, Shares	(37)
Forfeited or expired, Weighted-Average Exercise Price	$ 22.25
Outstanding as of April 1, 2012, Shares	3,827
Outstanding as of April 1, 2012, Weighted-Average Exercise Price	$ 25.06
Outstanding as of April 1, 2012, Weighted-Average Remaining Contractual Term (in years)	7.7
Outstanding as of April 1, 2012, Aggregate Intrinsic Value	$ 66,253
Exercisable as of April 1, 2012, Shares	1,190
Exercisable as of April 1, 2012, Weighted-Average Exercise Price	$ 21.11
Exercisable as of April 1, 2012, Weighted-Average Remaining Contractual Term (in years)	5.7
Exercisable as of April 1, 2012, Aggregate Intrinsic Value	25,337
Weighted-average assumptions used in estimating the fair values of stock options granted
Risk-free rate	2.00%	3.60%
Expected dividend yield	1.20%	1.00%
Expected volatility	44.00%	42.00%
Expected term (in years)	5.7	5.4
Stock-based compensation expense
Stock-based compensation expense	3,314	2,352
Product cost of revenue [Member]
Stock-based compensation expense
Stock-based compensation expense	240	165
Service cost of revenue [Member]
Stock-based compensation expense
Stock-based compensation expense	68	70
Research, development and engineering [Member]
Stock-based compensation expense
Stock-based compensation expense	867	809
Selling, general, and administrative [Member]
Stock-based compensation expense
Stock-based compensation expense	$ 2,139	$ 1,308

Share based compensation arrangement by share based payment award options exercisable aggregate 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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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Net number of share options (or share units) granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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Number of share options (or share units) exercised during the current period.

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