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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Goodwill And Other Intangible Assets [Line Items] |  |
Goodwill | $ 736,000 | $ 5,072,000
Other intangible assets | 12,583,000 | 12,583,000
Goodwill impairment | 4,336,000 |
Amortization expense | 1,677,000 | $ 1,746,000
Reporting unit, carrying value in excess of fair value | 8,000,000 |
Change in fair value of reporting unit | $ 1,000,000.0 |
Reporting unit change in discount rate | 3.00% |
Reporting unit change in revenue | 4.00% |
Reporting unit change in cost of revenue | 10.00% |
Reporting unit change in research and development expense | 13.00% |
Adjacent Markets |  |
Goodwill And Other Intangible Assets [Line Items] |  |
Goodwill impairment | $ 0 |
Emerging Markets |  |
Goodwill And Other Intangible Assets [Line Items] |  |
Goodwill impairment | 4,300,000 |
Aquana, LLC | Adjacent Markets |  |
Goodwill And Other Intangible Assets [Line Items] |  |
Goodwill | 700,000 |
Other intangible assets | 600,000 |
Aquana, LLC | Emerging Markets |  |
Goodwill And Other Intangible Assets [Line Items] |  |
Other intangible assets | 3,500,000 |
Aquana, LLC | Oil and Gas Markets |  |
Goodwill And Other Intangible Assets [Line Items] |  |
Other intangible assets | $ 1,500,000 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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