LEASES - Lease Cost (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2019 USD ($)
Lease, Cost [Abstract]
Weighted average remaining lease term, Operating leases	23 years
Weighted average remaining lease term, Finance leases	18 years
Weighted average discount rate, Operating leases	7.98%
Weighted average discount rate, Finance leases	5.01%
Operating lease cost
Operating leases	$ 9,601
Short-term leases	9,956
Variable leases	3,609
Finance lease cost:
Amortization of ROU assets	607
Interest on lease liabilities	397
Less: sublease income	(9,604)
Total lease cost	$ 14,566