DISCONTINUED OPERATIONS - Balance Sheets Information (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Assets of discontinued operations:
Prepaid and other current assets	$ 695	$ 2,091
Other long-term assets	3,607	6,406
Total assets of discontinued operations	4,302	8,497
Liabilities of discontinued operations:
Accrued liabilities, current	3,641	3,797
Other long-term liabilities	4,712	7,014
Total liabilities of discontinued operations	$ 8,353	$ 10,811