Reportable Segments - Schedule of Gross Revenue by Customer (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	$ 941,265	$ 857,155	$ 786,778
INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	403,241	374,986	395,878
BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	255,598	222,804	232,577
GEO
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	282,426	259,365	158,323
Public and quasi-public sector
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	591,916	581,265	503,329
Public and quasi-public sector \| INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	307,421	301,427	312,817
Public and quasi-public sector \| BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	57,753	61,313	61,726
Public and quasi-public sector \| GEO
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	226,742	218,525	128,786
Private sector
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	349,349	275,890	283,449
Private sector \| INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	95,820	73,559	83,061
Private sector \| BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	197,845	161,491	170,851
Private sector \| GEO
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	$ 55,684	$ 40,840	$ 29,537

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details

NV5 Global, Inc. 10-K