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DISCONTINUED OPERATIONS - Balance sheets information of installation services and other discontinued activities (Details) - Installation Services and Other Discontinued Activities - Discontinued Operations - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Prepaid and other current assets | $ 605 | $ 2,091
Other long-term assets | 3,424 | 6,406
Total assets of discontinued operations | 4,029 | 8,497
Accrued liabilities | 3,280 | 3,797
Other long-term liabilities | 3,794 | 7,014
Total liabilities of discontinued operations | $ 7,074 | $ 10,811

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