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Acquisition, Goodwill Impairment and Long-lived Asset Impairment (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011 | Nov. 21, 2011
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Fair Value as of acquisition date | $ 31,927 | $ 31,497 |  |
Amortization expense during period | (24,063) | (20,517) |  |
Net carrying amount, end of period | 7,864 | 10,980 |  |
Developed technology [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Fair Value as of acquisition date | 18,095 | 17,700 |  |
Amortization expense during period | (11,032) | (8,277) |  |
Net carrying amount, end of period | 7,063 | 9,423 |  |
Customer relationships [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Fair Value as of acquisition date | 9,573 | 9,538 |  |
Amortization expense during period | (9,263) | (8,643) |  |
Net carrying amount, end of period | 310 | 895 |  |
Nanda [Member] | Developed technology [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Net carrying amount, beginning of period | 7,130 | 8,603 |  |
Fair Value as of acquisition date |  |  |  | 9,200
Adjustments to carrying value during period | 315 | 279 | (393) |
Amortization expense during period | (1,961) | (1,752) | (204) |
Net carrying amount, end of period | 5,484 | 7,130 | 8,603 |
Nanda [Member] | Customer relationships [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Net carrying amount, beginning of period | 639 | 957 |  |
Fair Value as of acquisition date |  |  |  | 1,040
Adjustments to carrying value during period | 35 | 12 | (45) |
Amortization expense during period | (364) | (330) | (38) |
Net carrying amount, end of period | 310 | 639 | 957 |
Nanda [Member] | In-process research and development [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Net carrying amount, beginning of period | 0 | 316 |  |
Fair Value as of acquisition date |  |  |  | 330
Adjustments to carrying value during period | 0 | (316) | (14) |
Amortization expense during period | 0 | 0 | 0 |
Net carrying amount, end of period | 0 | 0 | 316 |
Nanda [Member] | Total identifiable intangible assets acquired [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Net carrying amount, beginning of period | 7,769 | 9,876 |  |
Fair Value as of acquisition date |  |  |  | 10,570
Adjustments to carrying value during period | 350 | (25) | (452) |
Amortization expense during period | (2,325) | (2,082) | (242) |
Net carrying amount, end of period | $ 5,794 | $ 7,769 | $ 9,876 |

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