COMMITMENTS AND CONTINGENT LIABILITIES (Details) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Aug. 31, 2009
Commitments and Contingencies Disclosure [Abstract]
Operating leases, rent expense, net	$ 35,726,000	$ 26,297,000	$ 26,180,000
Aggregate future minimum lease payments for operating leases in 2018	32,189,000
Aggregate future minimum lease payments for operating leases in 2019	26,365,000
Aggregate future minimum lease payments for operating leases in 2020	16,600,000
Aggregate future minimum lease payments for operating leases in 2021	10,811,000
Aggregate future minimum lease payments for operating leases in 2022	6,082,000
Aggregate future minimum lease payments for operating leases thereafter	12,135,000
Purchase obligation, due in next twelve months	226,026,000
Purchase obligation due in second year	5,569,000
Purchase obligation due in third year	2,000
Purchase obligation due in fourth year	1,000
Purchase obligation due in fifth year	1,470,000
Net capital cost value				$ 5,000,000
Obligation under consent order	$ 0
Net capital cost value in proposed remedial action plan				$ 10,000,000