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Commitments and Contingencies (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 26, 2015 USD ($) | Sep. 26, 2015 USD ($)
Loss Contingencies [Line Items] |  |
Increase in lease obligations |  | $ 17.9
Government billing |  |
Loss Contingencies [Line Items] |  |
Reserve for estimated possible loss | $ 1.5 | $ 1.5
Pending Litigation | Idexx |  |
Loss Contingencies [Line Items] |  |
Number of patents infringed upon | 3 |
Inestimable loss | we intend to defend against this proceeding vigorously and therefore an estimate of the possible loss or range of loss cannot be made |

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