Benefit Plans (Details 5)	3 Months Ended	9 Months Ended
Sep. 30, 2011 Year	Oct. 01, 2010 Year	Sep. 30, 2011 Year	Oct. 01, 2010 Year
Employee Stock Option [Member]
Weighted average assumptions:
Expected life (years)	4.75	3.52	4.75	4.00
Volatility	53.00%	55.00%	54.00%	56.00%
Risk-free interest rate	1.20%	1.10%	2.00%	1.60%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Employee Stock Purchase Plan Awards [Member]
Weighted average assumptions:
Expected life (years)	0.50	0.50	0.50	0.50
Volatility	46.00%	43.00%	45.00%	46.00%
Risk-free interest rate	0.10%	0.40%	0.20%	0.40%
Dividend yield	0.00%	0.00%	0.00%	0.00%

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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph e(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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm
Namespace Prefix:	us-gaap
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration