Strategic Alliance and Investment by Elutions, Inc. (Details 2) (Holder Redemption Option [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 04, 2015
Holder Redemption Option [Member]
Fair Value Instrument [Line Items]
Fair value at January 3, 2015	$ 337
Total unrealized losses	125
Fair value at April 4, 2015	$ 462

Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration