Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)	12 Months Ended
	Dec. 28, 2019 segment item
Goodwill
Number of reporting units | segment	1
Number of trailing quarters used to determine the control premium | item	4
Minimum | Non-competition agreements
Intangible Assets
Estimated useful life (in years)	5 years
Minimum | Customer relationships
Intangible Assets
Estimated useful life (in years)	8 years
Maximum | Non-competition agreements
Intangible Assets
Estimated useful life (in years)	9 years
Maximum | Customer relationships
Intangible Assets
Estimated useful life (in years)	10 years