CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Cash flows from operating activities:
Net income	$ 49,973	$ 47,147	$ 21,018
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44,063	44,971	45,488
Non-cash lease expense	12,813	10,191	9,469
Provision for doubtful accounts	(60)	1,243	4,311
Stock-based compensation	19,326	16,301	14,955
Change in fair value of contingent consideration	2,972	2,333	0
Gain on disposals of property and equipment	(328)	(1,102)	(462)
Deferred income taxes	(18,492)	(7,007)	(13,064)
Amortization of debt issuance costs	724	1,210	896
Changes in operating assets and liabilities, net of impact of acquisitions:
Billed receivables	10,212	2,677	(13,592)
Unbilled receivables	(3,303)	(12,573)	1,996
Prepaid expenses and other assets	(1,125)	(4,792)	4,680
Accounts payable	(1,673)	8,181	3,367
Accrued liabilities and other long-term liabilities	(19,901)	(12,507)	(4,865)
Contingent consideration	(800)	0	0
Billings in excess of costs and estimated earnings on uncompleted contracts	(296)	4,005	21,659
Other current liabilities	(125)	1,164	153
Net cash provided by operating activities	93,980	101,442	96,009
Cash flows from investing activities:
Cash paid for acquisitions (net of cash received from acquisitions)	(5,908)	(67,995)	(882)
Proceeds from sale of assets	87	1,639	1,670
Purchase of property and equipment	(15,689)	(13,903)	(9,855)
Net cash used in investing activities	(21,510)	(80,259)	(9,067)
Cash flows from financing activities:
Borrowings from Senior Credit Facility	0	138,750	0
Proceeds from common stock offering	0	172,500	0
Payments of borrowings from Senior Credit Facility	(65,000)	(323,832)	(36,625)
Payments on notes payable	(15,445)	(12,516)	(15,207)
Payments of contingent consideration	(1,464)	(1,329)	(1,579)
Payments of common stock offering costs	0	(10,657)	0
Payments of debt issuance costs	0	(976)	(447)
Purchases of common stock tendered by employees to satisfy the required withholding taxes related to stock-based compensation	0	(52)	0
Net cash used in financing activities	(81,909)	(38,112)	(53,858)
Net (decrease) increase in cash and cash equivalents	(9,439)	(16,929)	33,084
Cash and cash equivalents – beginning of period	47,980	64,909	31,825
Cash and cash equivalents – end of period	38,541	47,980	64,909
Supplemental disclosures of cash flow information:
Cash paid for interest	4,220	5,909	15,623
Cash paid for income taxes	29,639	26,270	19,748
Non-cash investing and financing activities:
Contingent consideration (earn-out)	6,299	5,133	255
Notes payable and other obligations issued for acquisitions	2,039	21,837	500
Stock issuance for acquisitions	1,352	5,203	1,855
Finance leases	2,490	376	1,244
Payment of contingent consideration and other obligations with common stock	$ 0	$ 209	$ 278