Commitments and Contingencies (Details) - USD ($)		12 Months Ended
	Dec. 27, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration		$ 9,700,000	$ 24,600,000
Payment of SEC penalty	$ 100,000
Credit line capacity		97,756,000
Fixed purchase provisions		89,200,000
Accrued Expenses
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration		2,400,000	2,400,000
Other Long-term Liabilities
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration		7,300,000	22,200,000
BioReference
Business Acquisition, Contingent Consideration [Line Items]
Severance costs		$ 3,000,000.0	$ 4,900,000	$ 5,800,000