Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 5,072		$ 5,072		$ 5,072
Other intangible assets	12,583		12,583		$ 12,583
Amortization expense	400	$ 400	893	$ 866
Aquana, LLC | Adjacent Markets
Goodwill And Other Intangible Assets [Line Items]
Goodwill	700		700
Other intangible assets	600		600
Aquana, LLC | Emerging Markets
Goodwill And Other Intangible Assets [Line Items]
Goodwill	4,300		4,300
Other intangible assets	4,000		4,000
Aquana, LLC | Oil and Gas Markets
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets	$ 1,800		$ 1,800