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Net revenues (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jul. 01, 2018 | Jul. 02, 2017
Concentration Risk [Line Items] |  |
Reserve for returns and allowances | $ 4.2 | $ 4.5
Reserve for the customer incentive programs, including distributor rebates | $ 13.6 | $ 10.7
Sales Revenue, Net | Hospitals And Healthcare Providers | Customer Concentration Risk |  |
Concentration Risk [Line Items] |  |
Percentage of total revenue | 87.00% |
Sales Revenue, Net | Other Medical Device Manufacturers | Customer Concentration Risk |  |
Concentration Risk [Line Items] |  |
Percentage of total revenue | 9.00% |
Sales Revenue, Net | Home Care Providers | Customer Concentration Risk |  |
Concentration Risk [Line Items] |  |
Percentage of total revenue | 4.00% |

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