Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 5,072		$ 5,072
Other intangible assets	12,583		$ 12,583
Amortization expense	446	$ 433
Aquana, LLC | Adjacent Markets
Goodwill And Other Intangible Assets [Line Items]
Goodwill	700
Other intangible assets	600
Aquana, LLC | Emerging Markets
Goodwill And Other Intangible Assets [Line Items]
Goodwill	4,300
Other intangible assets	4,200
Aquana, LLC | Oil and Gas Markets
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets	$ 2,000