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Revenues (Activities and Ending Reserve Balances for Significant Categories of Discounts and Allowances) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 28, 2018 | Dec. 29, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at beginning of period | $ 9,493 | $ 5,574
Provision related to sales made in: |  |
Current period | 119,600 | 55,001
Prior periods | (350) | (1,441)
Payments and customer credits issued | (111,467) | (49,641)
Balance at end of period | 17,276 | 9,493
Chargebacks and Discounts for Prompt Payment |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at beginning of period | 1,928 | 1,802
Provision related to sales made in: |  |
Current period | 75,543 | 33,310
Prior periods | (403) | (817)
Payments and customer credits issued | (74,746) | (32,367)
Balance at end of period | 2,322 | 1,928
Other Customer Credits/Fees and Co-pay Assistance |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at beginning of period | 1,795 | 794
Provision related to sales made in: |  |
Current period | 13,015 | 7,301
Prior periods | 206 | 0
Payments and customer credits issued | (11,978) | (6,300)
Balance at end of period | 3,038 | 1,795
Rebates |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at beginning of period | 5,770 | 2,627
Provision related to sales made in: |  |
Current period | 31,040 | 14,390
Prior periods | (153) | (624)
Payments and customer credits issued | (24,741) | (10,623)
Balance at end of period | 11,916 | 5,770
Returns |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at beginning of period | 0 | 351
Provision related to sales made in: |  |
Current period | 2 | 0
Prior periods | 0 | 0
Payments and customer credits issued | (2) | (351)
Balance at end of period | $ 0 | $ 0

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