Stock Based Compensation Expense (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 30, 2012	Apr. 01, 2011
Common Stock and Stock-based Compensation (Textual) [Abstract]
Stock-based compensation expense	$ 1.4	$ 1.0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options	11,000	49,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights to employees	52,000
Fair value of the SARs and Restricted stock	$ 29.40
Total cash received from the exercise of stock options	$ 0.1	$ 0.6
Stock appreciation rights vested period	3 years
Performance Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights to employees	51,000
Fair value of the SARs and Restricted stock	$ 25.55
Stock appreciation rights vested period	3 years
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights to employees	182,000
Fair value of the SARs and Restricted stock	$ 16.35
Expire period of option rights granted to non employees	7 years
Stock appreciation rights vested period	3 years
Number of stock appreciation rights	23,000	7,000
Stock appreciation right strike price	$ 29.45

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Share Based Compensation Arrangement by Share Based Payment Award Award Expiration Term.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options exercised in period.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options nonvested strike price.

+ References

No definition available.

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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-Name Statement of Financial Accounting Standard (FAS)

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

+ References

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- Definition

Description of the period of time 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, which may be expressed in a variety of ways (for example, in years, month and year).

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- Definition

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).

+ References

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

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

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-Name Regulation S-X (SX)

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