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REVENUE FROM CONTRACTS WITH CUSTOMERS - NARRATIVE (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |
Contract with customer, liability, current | $ 377 | $ 1,087
Contract with customer, liability, revenue recognized | 1,015 | 394
Revenue, remaining performance obligation (backlog) | $ 3,587 |
Percentage anticipated to be recognized in next 12 months | 100.00% |
Capitalized contract cost net, preconstruction | $ 504 | 689
Capitalized contract cost, amortization of preconstruction | 326 | 296
Capitalized contract cost, impairment loss | 0 | 0
Uninstalled materials, current | $ 348 | $ 351
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Contract receivable retainage percentage | 5.00% |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Contract receivable retainage percentage | 10.00% |

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- Definition Amount of amortization expense 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 of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: 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 2: 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-2 + Details
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