Assets Held for Sale and Net Gain on Disposition (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 29, 2012	Sep. 29, 2012	Dec. 31, 2011
Assets Held for Sale and Net Gain on Disposition (Textual) [Abstract]
Total assets held for sale	$ 1.6	$ 1.6	$ 2.3
Total assets held for sale related to the Fremont, CA property	6.6	6.6
Gain from real properties sold	$ 9.2	$ 9.7

Current assets (normally turning over within one year or one business cycle if longer) that are held for sale apart from normal operations and anticipated to be sold within one year.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Name:	us-gaap_AssetsHeldForSaleCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant