Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Disaggregation of Revenue [Line Items]
Time frame for majority of payments on health care plans and programs accounts (in days)			90 days
Credit loss expense		$ 1,800	$ 432	$ 3,865
Deferred revenue	$ 71,100		71,100
Previously deferred revenue recognized	$ 24,200	$ 27,500	$ 52,200	$ 55,300
Minimum
Disaggregation of Revenue [Line Items]
General payment terms for accounts on health care plans and programs (in days)			14 days
Unearned revenue, estimated delivery time for period end calculation (in days)			7 days
Maximum
Disaggregation of Revenue [Line Items]
General payment terms for accounts on health care plans and programs (in days)			120 days
Unearned revenue, estimated delivery time for period end calculation (in days)			10 days