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
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