Acquisitions - Additional Information (Details) - USD ($)				3 Months Ended		12 Months Ended
	Dec. 02, 2022	Nov. 02, 2022	May 04, 2022	Mar. 31, 2023	Sep. 30, 2022	Dec. 31, 2022	Jul. 15, 2022
Business Acquisition [Line Items]
Goodwill				$ 53,082,000		$ 53,210,000
Customer relationships
Business Acquisition [Line Items]
Weighted average useful lives				10 years 8 months 26 days		11 years 11 months 19 days
Contract rights
Business Acquisition [Line Items]
Weighted average useful lives				1 year 6 months 10 days		2 years 5 months 19 days
McMahon Associates, Inc. (“McMahon”)
Business Acquisition [Line Items]
Total consideration paid			$ 18,200,000	$ 18,189,000
Issuance of common stock for acquisitions (in shares)			476,796
Price per share (in dollars per share)			$ 16.64
Equity issued in business combination, fair value			$ 7,900,000
Cash, promissory note and assumed liabilities payment on business combination			10,300,000
Deferred tax assets acquired			0
Deferred tax liabilities acquired			$ 0
Statutory income tax rate				28.90%
Intangible assets				$ 3,392,000
Goodwill				14,414,000
McMahon Associates, Inc. (“McMahon”) | Promissory Note First and Second
Business Acquisition [Line Items]
Interest rate			3.50%
Project Design Consultants, LLC (“PDC”)
Business Acquisition [Line Items]
Total consideration paid				14,178,000	$ 14,200,000
Deferred tax assets acquired							$ 0
Deferred tax liabilities acquired							$ 0
Intangible assets				10,344,000
Goodwill				$ 2,776,000
Project Design Consultants, LLC (“PDC”) | Customer relationships
Business Acquisition [Line Items]
Weighted average useful lives				10 years
Project Design Consultants, LLC (“PDC”) | Contract rights
Business Acquisition [Line Items]
Weighted average useful lives				3 years
Project Design Consultants, LLC (“PDC”) | Promissory Note First
Business Acquisition [Line Items]
Promissory note interest rate					4.75%
Project Design Consultants, LLC (“PDC”) | Promissory Note Second
Business Acquisition [Line Items]
Price per share (in dollars per share)					$ 14.00
Promissory note interest rate							4.75%
Anchor Consultants, LLC (“Anchor”)
Business Acquisition [Line Items]
Total consideration paid					$ 4,000,000
Goodwill				$ 4,000,000
Anchor Consultants, LLC (“Anchor”) | Promissory Note
Business Acquisition [Line Items]
Price per share (in dollars per share)					$ 18.00
Promissory note interest rate					5.50%
SEI Engineering , LLC
Business Acquisition [Line Items]
Total consideration paid		$ 800,000
Cash, promissory note and assumed liabilities payment on business combination		400,000
Deferred tax assets acquired		0
Deferred tax liabilities acquired		$ 0
SEI Engineering , LLC | Promissory Note First and Second
Business Acquisition [Line Items]
Promissory note interest rate		6.25%
Spatial Acuity, LLC
Business Acquisition [Line Items]
Total consideration paid		$ 4,100,000
Issuance of common stock for acquisitions (in shares)		134,042
Price per share (in dollars per share)		$ 15.15
Equity issued in business combination, fair value		$ 2,000,000
Cash, promissory note and assumed liabilities payment on business combination		2,100,000
Deferred tax assets acquired		0
Deferred tax liabilities acquired		0
Additional consideration in form of stock, cash and notes		3,000,000
Liability to contingent consideration		$ 500,000
Spatial Acuity, LLC | Promissory Note First and Second
Business Acquisition [Line Items]
Promissory note interest rate		6.25%
H2H Geoscience Engineering, PLLC
Business Acquisition [Line Items]
Total consideration paid	$ 3,700,000
Cash, promissory note and assumed liabilities payment on business combination	1,400,000
Deferred tax assets acquired	0
Deferred tax liabilities acquired	$ 0
Measurement period adjustment				$ 49,000
H2H Geoscience Engineering, PLLC | Promissory Note First
Business Acquisition [Line Items]
Promissory note interest rate	7.00%
H2H Geoscience Engineering, PLLC | Promissory Note Second
Business Acquisition [Line Items]
Price per share (in dollars per share)	$ 18.00
Promissory note interest rate	7.00%