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Business Acquisitions ChanTest, Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Oct. 29, 2014 | Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013
Business Acquisition [Line Items] |  |  |  |
Consideration, net of cash acquired |  | $ 247,651,000 | $ 234,267,000 | $ 29,218,000
ChanTest |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Consideration, gross | $ 59,200,000 |  |  |
Contingent consideration, liability | 300,000 |  |  |
Contingent consideration | 2,000,000.0 |  |  |
Consideration, net of cash acquired | 52,000,000 |  |  |
Cash acquired from acquisition | $ 7,200,000 |  |  |
ChanTest |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration, gain |  | $ 300,000 |  |
Transaction and integration costs |  |  | $ 1,100,000 |

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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