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Revenue - Contract Balances (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Sep. 30, 2020
Change In Contract With Customer, Assets [Roll Forward] |  |
Contract assets - Beginning balance | $ 11,997,000 |
Additional revenue recognized over-time | 49,070,000 |
Less amounts billed to the customers | (46,401,000) |
Contract assets - Ending balance | 14,666,000 | $ 11,997,000
Change In Contract With Customer, Liability [Roll Forward] |  |
Contract liabilities (included within Accrued liabilities) - Beginning balance | (636,000) |
Payments received in advance of performance obligations | (628,000) |
Performance obligations satisfied | 763,000 |
Contract liabilities (included within Accrued liabilities) - Ending balance | (501,000) | (636,000)
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 -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
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