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Business Acquisitions - ChanTest, Additional Information (Details) - USD ($) |  | 9 Months Ended
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Oct. 29, 2014 | Sep. 26, 2015 | Sep. 27, 2014
Business Acquisition [Line Items] |  |  |
Total purchase price allocation |  | $ 211,974,000 | $ 183,151,000
ChanTest |  |  |
Business Acquisition [Line Items] |  |  |
Preliminary purchase price | $ 59,200,000 |  |
Contingent consideration | 300,000 |  |
Maximum contingent consideration limit | 2,000,000 |  |
Total purchase price allocation | 52,029,000 |  |
Cash acquired from acquisition | $ 7,200,000 |  |

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