Revenue - Schedule of Revenue by Payer Type as a Percentage of Revenue (Detail) - Customer Concentration Risk - Total revenue	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	100.00%	100.00%	100.00%	100.00%
Medicaid MCO
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	54.30%	52.60%	51.90%	54.20%
Medicaid
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	21.70%	23.80%	21.90%	24.30%
Commercial
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	9.80%	12.30%	9.90%	11.80%
Medicare
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	14.10%	11.00%	16.20%	9.40%
Self-pay
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	0.10%	0.30%	0.10%	0.30%