Reportable Segments - Revenue by Customer Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	$ 786,778	$ 706,706	$ 659,296
INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	395,878	383,725	352,965
BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	232,577	185,995	157,432
GEO
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	158,323	136,986	148,899
Public and quasi-public sector
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	503,329	458,345	448,855
Public and quasi-public sector | INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	312,817	304,753	279,965
Public and quasi-public sector | BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	61,726	66,964	67,434
Public and quasi-public sector | GEO
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	128,786	86,628	101,456
Private sector
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	283,449	248,361	210,441
Private sector | INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	83,061	78,972	73,000
Private sector | BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	170,851	119,031	89,998
Private sector | GEO
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	$ 29,537	$ 50,358	$ 47,443