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Revenue - Contract Balances (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Change In Contract With Customer, Assets [Roll Forward] |  |
Contract assets - Beginning balance | $ 10,172,000 | $ 12,874,000
Additional revenue recognized over-time | 40,265,000 | 46,747,000
Less amounts billed to the customers | (40,346,000) | (49,449,000)
Contract assets - Ending balance | 10,091,000 | 10,172,000
Change In Contract With Customer, Liability [Roll Forward] |  |
Contract liabilities (included within Accrued liabilities) - Beginning balance | (807,000) | (236,000)
Payments received in advance of performance obligations | (2,242,000) | (1,691,000)
Performance obligations satisfied | 1,899,000 | 1,120,000
Contract liabilities (included within Accrued liabilities) - Ending balance | (1,150,000) | (807,000)
Impairment loss on contract assets | $ 0 | $ 0

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- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 + Details
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