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Goodwill and Other Intangible Assets (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 29, 2012 | Dec. 31, 2011 | Jan. 01, 2011
Goodwill |  |  |
Balance at the beginning of the period | $ 115,489,000 | $ 112,296,000 |
Additions due to business combinations | 14,776,000 | 4,097,000 |
Adjustments |  | (904,000) |
Balance at the end of the period | 130,265,000 | 115,489,000 | 112,296,000
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Weighted-Average Amortization Period | 10 years |  |
Intangible assets subject to amortization, Gross Amount | 107,430,000 | 82,010,000 |
Intangible assets subject to amortization, Accumulated Amortization | (31,490,000) | (30,955,000) |
Total intangible assets, Gross Amount | 122,240,000 | 90,960,000 |
Intangible assets acquired in acquisition of Ember | 42,100,000 |  |
Fully amortized intangible assets, gross | 9,300,000 |  |
Impaired intangible assets, gross | 1,600,000 |  |
Unamortized intangible assets, net | 700,000 |  |
Impairment of intangible assets | 700,000 |  |
Amortization expense related to intangible assets | 10,700,000 | 9,900,000 | 7,500,000
Estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years |  |  |
2013 | 11,213,000 |  |
2014 | 10,372,000 |  |
2015 | 9,981,000 |  |
2016 | 9,331,000 |  |
2017 | 8,364,000 |  |
In Process research and development |  |  |
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Intangible assets not subject to amortization, Gross and Net Amount | 14,810,000 | 8,950,000 |
Core and developed technology |  |  |
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Weighted-Average Amortization Period | 10 years |  |
Intangible assets subject to amortization, Gross Amount | 95,420,000 | 79,500,000 |
Intangible assets subject to amortization, Accumulated Amortization | (30,145,000) | (30,432,000) |
Customer relationships |  |  |
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Weighted-Average Amortization Period | 9 years |  |
Intangible assets subject to amortization, Gross Amount | 8,100,000 | 2,510,000 |
Intangible assets subject to amortization, Accumulated Amortization | (1,057,000) | (523,000) |
Patents |  |  |
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Weighted-Average Amortization Period | 6 years |  |
Intangible assets subject to amortization, Gross Amount | 3,000,000 |  |
Intangible assets subject to amortization, Accumulated Amortization | (250,000) |  |
Trademarks |  |  |
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Weighted-Average Amortization Period | 12 years |  |
Intangible assets subject to amortization, Gross Amount | 910,000 |  |
Intangible assets subject to amortization, Accumulated Amortization | $ (38,000) |  |

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