Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands				1 Months Ended		12 Months Ended
	Jul. 02, 2021	Nov. 13, 2018	Jul. 27, 2018	Oct. 31, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Commitments And Contingencies [Line Items]
Non-current contingent consideration					$ 5,210	$ 5,210	$ 10,962
Cash contingent earn-out payments						1,421	78
Contingent earn-out liability					800	800
Change in estimated fair value of contingent consideration						(3,524)	1,100
Rent expense under Operating Leases						500	500
Future minimum lease obligations					$ 1,351	$ 1,351
Maximum
Commitments And Contingencies [Line Items]
Operating lease term					7 years	7 years
Quantum
Commitments And Contingencies [Line Items]
Non-current contingent consideration			$ 7,700
Contingent cash payments earn-out period			4 years
Contingent payments earn-out period ending month and year			2022-07
Contingent payments maximum earn-out amount			$ 23,500
Cash contingent earn-out payments				$ 800	$ 1,400		100
Contingent earn-out liability							$ 5,800
Change in estimated fair value of contingent consideration						$ (2,700)
Quantum | CBP
Commitments And Contingencies [Line Items]
Awarded contract amount					10,000	10,000
Optoseis Technology
Commitments And Contingencies [Line Items]
Non-current contingent consideration		$ 4,300
Contingent cash payments earn-out period		5 years 6 months
Contingent payments earn-out period ending month and year		2024-05
Contingent payments maximum earn-out amount		$ 23,200
Contingent earn-out liability					5,200	5,200
Change in estimated fair value of contingent consideration						(800)
Estimated fair value of earn-out liability					$ 4,400	$ 4,400
Aquana
Commitments And Contingencies [Line Items]
Contingent cash payments earn-out period	6 years