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		6 Months Ended
	Jul. 01, 2022	Jul. 02, 2021	Jul. 01, 2022	Jul. 02, 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	24.20%	28.90%	23.90%	28.60%
Manufacturing [Member]
Concentration Risk [Line Items]
Total revenue	15.20%	12.70%	14.50%	12.60%
Financial Services [Member]
Concentration Risk [Line Items]
Total revenue	15.30%	17.50%	15.80%	17.40%
Energy [Member]
Concentration Risk [Line Items]
Total revenue	6.60%	5.90%	5.90%	5.70%
General Markets [Member]
Concentration Risk [Line Items]
Total revenue	21.10%	20.50%	22.40%	20.70%
Healthcare [Member]
Concentration Risk [Line Items]
Total revenue	17.60%	14.50%	17.50%	15.00%