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
	Apr. 01, 2022	Apr. 02, 2021
Concentration Risk [Line Items]
Total revenue	100.00%	100.00%
Technology Service Providers [Member]
Concentration Risk [Line Items]
Total revenue	23.80%	30.80%
Manufacturing [Member]
Concentration Risk [Line Items]
Total revenue	13.90%	12.40%
Financial Services [Member]
Concentration Risk [Line Items]
Total revenue	16.50%	17.00%
Energy [Member]
Concentration Risk [Line Items]
Total revenue	5.30%	5.50%
General Markets [Member]
Concentration Risk [Line Items]
Total revenue	23.10%	18.80%
Healthcare [Member]
Concentration Risk [Line Items]
Total revenue	17.40%	15.50%