DISCONTINUED OPERATIONS - Balance Sheets Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Assets of discontinued operations:
Prepaid and other current assets	$ 1,525	$ 2,091
Other long-term assets	5,295	6,406
Total assets of discontinued operations	6,820	8,497
Liabilities of discontinued operations:
Accrued liabilities, current	4,600	3,797
Other long-term liabilities	6,415	7,014
Total liabilities of discontinued operations	$ 11,015	$ 10,811