Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Cash Flows From Operating Activities:
Net income	$ 23,756	$ 26,856	$ 24,006
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,816	17,384	13,128
Non-cash lease expense	9,410	0	0
Provision for doubtful accounts	1,239	797	586
Stock based compensation	10,430	6,697	4,011
Change in fair value of contingent consideration	(216)	424	(832)
Loss on disposals of property and equipment	21	26	35
Deferred income taxes	(6,634)	(3,585)	(11,242)
Amortization of debt issuance costs	131	0	0
Changes in operating assets and liabilities, net of impact of acquisitions:
Billed receivables	5,140	(8,662)	(10,911)
Unbilled receivables	(11,807)	(2,813)	(3,802)
Prepaid expenses and other assets	(3,599)	(109)	295
Accounts payable	534	398	(1,495)
Accrued liabilities	(7,315)	(2,984)	(2,442)
Income taxes payable	(2,697)	(3,405)	4,969
Billings in excess of costs and estimated earnings on uncompleted contracts	(4,322)	3,964	436
Deposits	13	11	883
Net cash provided by operating activities	39,900	34,999	17,625
Cash Flows From Investing Activities:
Cash paid for acquisitions (net of cash received from acquisitions)	(348,375)	(58,155)	(60,633)
Purchase of property and equipment	(2,625)	(2,203)	(2,239)
Net cash used in investing activities	(351,000)	(60,358)	(62,872)
Cash Flows From Financing Activities:
Proceeds from common stock offering	0	100,330	0
Proceeds from borrowings from Senior Credit Facility	330,457	0	47,000
Payments of borrowings from Senior Credit Facility	(10,000)	(36,500)	(10,500)
Payments on notes payable	(13,393)	(9,741)	(7,605)
Proceeds from exercise of warrant	0	1,093	0
Payments of contingent consideration	(1,202)	(728)	(563)
Payments of common stock offering costs	0	(6,861)	0
Payments of debt issuance costs	(3,676)	(246)	0
Net cash provided by financing activities	302,186	47,347	28,332
Net (decrease) increase in Cash and Cash Equivalents	(8,914)	21,988	(16,915)
Cash and cash equivalents – beginning of period	40,739	18,751	35,666
Cash and cash equivalents – end of period	31,825	40,739	18,751
Supplemental disclosures of cash flow information:
Cash paid for interest	1,218	1,895	1,508
Cash paid for income taxes	16,215	13,634	7,607
Contingent Consideration Earn-Out, Non-Cash	1,641	3,112	908
Non-cash investing and financing activities:
Notes payable and other obligations issued for acquisitions	10,044	23,987	9,371
Stock issuance for acquisitions	3,511	9,330	3,856
Stock issuance for acquisitions		9,330	3,856
Finance leases	1,084	2,884	0
Payment of contingent consideration with common stock	$ 724		63
Payment of contingent consideration and other obligations with common stock		$ 0	$ 63