LEASES - Lease Position (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Oct. 01, 2019
Leases [Abstract]
Operating lease commitments disclosed	$ 54,333	$ 62,218
Discounted using the lessee's incremental borrowing rate at the date of initial application	53,107	57,323
(Less): short-term leases recognized on a straight-line basis as expense	(5,602)	(1,252)
Lease liability recognized	47,505	56,071
Current lease liabilities	11,792	16,277
Non-current lease liabilities	$ 35,713	$ 39,794