The aggregate purchase price consideration paid in connection with this stock acquisition was $10.7 million in cash, subject to customary closing working capital adjustments plus an earnout of up to $12.0 million contingent upon the achievement of certain financial targets to be paid upon the first, second and third anniversaries of the closing.

the Company acquired AltaVista Solutions (“Alta Vista”), a provider of testing and inspection services primarily to infrastructure clients. Alta Vista is headquartered in Oakland, California and has offices in California and New York. The purchase agreement called for the Company to pay Alta Vista up to $15.1 million in the form of cash and stock consideration. The Company issued 776,197 shares of Class B common stock to the former owners of Alta Vista, which represented $7.0 million of the total consideration paid. Total consideration may also be increased or decreased based on results in future years. Final value will be subject to the resolution of certain contingencies.

Business acquisition description

the Company acquired Atlantic Engineering Laboratories, Inc. and Atlantic Engineering Laboratories of New York, Inc. (collectively, “AEL”) for cash and an amount of equity consideration totalling $24.5 million. The Company issued 738,566 shares of Class A common stock to the former owner of AEL, which represented $7.5 million of the total consideration paid. AEL is a materials testing and inspection firm based in Avenel, New Jersey, and provides steel, concrete, soil and other testing and inspection services to a diverse mix of public and private clients primarily in New York and New Jersey. AEL added approximately 290 professionals to the Company’s workforce and is expected to strengthen the Company’s materials testing and inspection services in the Northeast. Total consideration may also be increased or decreased based on results in future years. Final value will be subject to the resolution of certain contingencies.

the Company acquired WesTest LLC (“WesTest”), a testing and engineering services provider with operations in Colorado and Wyoming. WesTest, headquartered in Lakewood, Colorado, received consideration of $4.1 million in the form of cash and stock consideration. The Company issued 285,115 shares of Class A common stock to the former owner of WesTest, which represented $1.6 million of the total consideration paid. Total consideration may also be increased or decreased based on results in future years. Final value will be subject to the resolution of certain contingencies.

Business Acquisitions (Details) [Line Items]

Business Acquisitions (Details) - USD ($) $ in Millions			1 Months Ended			3 Months Ended		6 Months Ended
Business Acquisitions (Details) - USD ($) $ in Millions	Jul. 01, 2021	Apr. 14, 2021	Nov. 30, 2020	Sep. 30, 2020	Feb. 29, 2020	Jul. 02, 2021	Jun. 30, 2020	Jul. 02, 2021	Jun. 30, 2020
Business Acquisitions (Details) [Line Items]
Acquisition, description					The aggregate purchase price consideration paid in connection with this stock acquisition was $10.7 million in cash, subject to customary closing working capital adjustments plus an earnout of up to $12.0 million contingent upon the achievement of certain financial targets to be paid upon the first, second and third anniversaries of the closing.
Acquisition costs								$ 1.4	$ 0.6
Business Acquisition [Member]
Business Acquisitions (Details) [Line Items]
Business acquisition description				the Company acquired AltaVista Solutions (“Alta Vista”), a provider of testing and inspection services primarily to infrastructure clients. Alta Vista is headquartered in Oakland, California and has offices in California and New York. The purchase agreement called for the Company to pay Alta Vista up to $15.1 million in the form of cash and stock consideration. The Company issued 776,197 shares of Class B common stock to the former owners of Alta Vista, which represented $7.0 million of the total consideration paid. Total consideration may also be increased or decreased based on results in future years. Final value will be subject to the resolution of certain contingencies.
Acquisition costs						$ 0.7	$ 0.3
WesTest LLC [Member]
Business Acquisitions (Details) [Line Items]
Business acquisition description		the Company acquired Atlantic Engineering Laboratories, Inc. and Atlantic Engineering Laboratories of New York, Inc. (collectively, “AEL”) for cash and an amount of equity consideration totalling $24.5 million. The Company issued 738,566 shares of Class A common stock to the former owner of AEL, which represented $7.5 million of the total consideration paid. AEL is a materials testing and inspection firm based in Avenel, New Jersey, and provides steel, concrete, soil and other testing and inspection services to a diverse mix of public and private clients primarily in New York and New Jersey. AEL added approximately 290 professionals to the Company’s workforce and is expected to strengthen the Company’s materials testing and inspection services in the Northeast. Total consideration may also be increased or decreased based on results in future years. Final value will be subject to the resolution of certain contingencies.	the Company acquired WesTest LLC (“WesTest”), a testing and engineering services provider with operations in Colorado and Wyoming. WesTest, headquartered in Lakewood, Colorado, received consideration of $4.1 million in the form of cash and stock consideration. The Company issued 285,115 shares of Class A common stock to the former owner of WesTest, which represented $1.6 million of the total consideration paid. Total consideration may also be increased or decreased based on results in future years. Final value will be subject to the resolution of certain contingencies.
O’Neill Services Group [Member]
Business Acquisitions (Details) [Line Items]
Business acquisition description	the Company acquired O’Neill Services Group (“O’Neill), a quality assurance and environmental services firm that services clients throughout the Pacific Northwest. O’Neill, headquartered in Redmond, Washington, employs 90 people and received $24.4 million in the form of cash and stock consideration. The Company issued 653,728 shares of Class A common stock which represented $6.5 million of the total consideration received. Total consideration may also be increased or decreased based on results in future years.