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Revenues - Revenues Disaggregated by Significant Customer (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 29, 2019 | Mar. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total revenues | $ 215,487 | $ 213,719
Revenue | Customer Concentration Risk |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Percent of total revenues | 100.00% | 100.00%
Caremark L.L.C. |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total revenues | $ 32,698 | $ 26,388
Caremark L.L.C. | Revenue | Customer Concentration Risk |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Percent of total revenues | 15.00% | 12.00%
Affiliates of McKesson Corporation |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total revenues | $ 25,311 | $ 21,331
Affiliates of McKesson Corporation | Revenue | Customer Concentration Risk |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Percent of total revenues | 12.00% | 10.00%
Accredo Health, Incorporated |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total revenues | $ 22,495 | $ 18,286
Accredo Health, Incorporated | Revenue | Customer Concentration Risk |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Percent of total revenues | 10.00% | 9.00%
Affiliates of AmerisourceBergen Corporation |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total revenues | $ 21,902 | $ 15,736
Affiliates of AmerisourceBergen Corporation | Revenue | Customer Concentration Risk |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Percent of total revenues | 10.00% | 7.00%
Ipsen |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total revenues | $ 21,868 | $ 53,809
Ipsen | Revenue | Customer Concentration Risk |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Percent of total revenues | 10.00% | 25.00%
Others, individually less than 10% of Total revenues for all periods presented |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total revenues | $ 91,213 | $ 78,169
Others, individually less than 10% of Total revenues for all periods presented | Revenue | Customer Concentration Risk |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Percent of total revenues | 43.00% | 37.00%

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