Summary of Significant Accounting Policies - Summary of IT Solutions and IT and Other Staffing Revenue as Percentage of Total Revenue (Details) - Product Concentration Risk [Member] - Sales Revenue, Services, Net [Member]	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jun. 26, 2020	Jul. 02, 2021	Jun. 26, 2020
Product Information [Line Items]
Revenue, percent	100.00%	100.00%	100.00%	100.00%
IT Solutions [Member]
Product Information [Line Items]
Revenue, percent	44.90%	42.10%	44.80%	41.00%
IT and Other Staffing [Member]
Product Information [Line Items]
Revenue, percent	55.10%	57.90%	55.20%	59.00%