DISCONTINUED OPERATIONS - Balance Sheets Information (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Assets of discontinued operations:
Prepaid and other current assets	$ 1,951	$ 321
Other long-term assets	6,086	2,888
Total assets of discontinued operations	8,037	3,209
Liabilities of discontinued operations:
Accrued liabilities, current	3,730	4,333
Other long-term liabilities	6,281	3,331
Total liabilities of discontinued operations	$ 10,011	$ 7,664