Summary of Significant Accounting Policies - Revenue by Vertical Market as Percentage of Total Revenue (Details) - Customer Concentration Risk [Member] - Sales Revenue, Services, Net [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Oct. 01, 2021	Sep. 30, 2022	Oct. 01, 2021
Concentration Risk [Line Items]
Total revenue	100.00%	100.00%	100.00%	100.00%
Technology Service Providers [Member]
Concentration Risk [Line Items]
Total revenue	22.40%	28.00%	23.50%	28.40%
Manufacturing [Member]
Concentration Risk [Line Items]
Total revenue	16.90%	12.30%	15.20%	12.10%
Financial Services [Member]
Concentration Risk [Line Items]
Total revenue	15.10%	17.40%	15.60%	17.80%
Energy [Member]
Concentration Risk [Line Items]
Total revenue	5.70%	5.30%	5.80%	5.60%
General Markets [Member]
Concentration Risk [Line Items]
Total revenue	20.80%	19.30%	21.90%	20.20%
Healthcare [Member]
Concentration Risk [Line Items]
Total revenue	19.10%	17.70%	18.00%	15.90%