Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jul. 31, 2021
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 5,072,000	$ 4,337,000
Other intangible assets	12,583,000	11,918,000
Goodwill impairment		671,000
Amortization expense	1,746,000	1,732,000
Adjacent Markets
Goodwill And Other Intangible Assets [Line Items]
Goodwill impairment	0
Emerging Markets
Goodwill And Other Intangible Assets [Line Items]
Goodwill impairment	0
Oil and Gas Markets
Goodwill And Other Intangible Assets [Line Items]
Goodwill impairment		$ 700,000
Aquana, LLC | Adjacent Markets
Goodwill And Other Intangible Assets [Line Items]
Goodwill			$ 700,000
Other intangible assets			$ 700,000
Aquana, LLC | Emerging Markets
Goodwill And Other Intangible Assets [Line Items]
Goodwill	4,300,000
Other intangible assets	4,500,000
Aquana, LLC | Oil and Gas Markets
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets	$ 2,100,000