DISCONTINUED OPERATIONS - Balance Sheets Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Assets of discontinued operations:
Total assets of discontinued operations	$ 3,225	$ 3,240
PPC and Installation Services and other discontinued activities | Discontinued Operations [Member]
Assets of discontinued operations:
Prepaid and other current assets	324	324
Other long-term assets	2,901	2,916
Total assets of discontinued operations	3,225	3,240
Liabilities of discontinued operations:
Accrued liabilities, current	11,657	7,210
Other long-term liabilities	2,307	2,647
Total liabilities of discontinued operations	$ 13,964	$ 9,857