Acquisitions (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 28, 2012 Neuro Nexus Technologies Inc [Member]	Dec. 30, 2011 Micro Power Electronics Inc [Member]	Dec. 28, 2012 Patented Technology [Member] Neuro Nexus Technologies Inc [Member]	Dec. 30, 2011 Patented Technology [Member] Micro Power Electronics Inc [Member]	Dec. 28, 2012 Customer Lists [Member] Neuro Nexus Technologies Inc [Member]	Dec. 30, 2011 Customer Lists [Member] Micro Power Electronics Inc [Member]	Dec. 30, 2011 Trade Names Member [Member] Micro Power Electronics Inc [Member]	Dec. 30, 2011 Noncompete Agreements [Member] Micro Power Electronics Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortizing intangible assets	$ 2,927	$ 28,914	$ 1,058	$ 8,051	$ 1,869	$ 19,569	$ 379	$ 915
Weighted Average Amortization Period (Years)	7 years	4 years	6 years	4 years	7 years	5 years	2 years	4 years
Weighted Average Useful Life (Years)	13 years	13 years	10 years	10 years	15 years	14 years	2 years	8 years
Weighted Average Discount Rate	13.00%	13.00%	14.00%	14.00%	13.00%	12.00%	13.00%	14.00%
Minimum royalty rate assumed in valuation			2.00%	2.00%
Maximum royalty rate assumed in valuation			6.00%	4.00%			0.50%

Maximum royalty rate assumed to value an acquired finite lived intangible asset

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- Definition

Minimum royalty rate assumed to value an acquired finite lived intangible asset

+ References

No definition available.

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- Definition

The calculated weighted-average discount rate used to calculate the fair value of a major class of finite lived intangible assets acquired during the current period.

+ References

No definition available.

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- Definition

The calculated weighted-average useful life of a major class of finite lived intangible assets acquired during the current period.

+ References

No definition available.

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

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- Definition

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph e

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-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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