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Revenues - Activities and Ending Reserve Balances for Significant Categories of Discounts and Allowances (Details) $ in Thousands	6 Months Ended
	Jun. 29, 2018 USD ($)
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance	$ 9,493
Provision related to sales made in:
Current period	52,742
Prior periods	(769)
Payments and customer credits issued	(47,719)
Balance	13,747
Chargebacks and Discounts for Prompt Payment
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance	1,928
Provision related to sales made in:
Current period	32,088
Prior periods	(737)
Payments and customer credits issued	(30,675)
Balance	2,604
Other Customer Credits/Fees and Co-pay Assistance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance	1,795
Provision related to sales made in:
Current period	6,336
Prior periods	0
Payments and customer credits issued	(6,850)
Balance	1,281
Rebates
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance	5,770
Provision related to sales made in:
Current period	14,318
Prior periods	(32)
Payments and customer credits issued	(10,194)
Balance	$ 9,862

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- Definition

Valuation Allowances And Reserves, Additions To Provision [Abstract]

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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