INCOME TAXES, INCOME TAX CARRYFORWARDS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Loss Carryforwards [Line Items]
Tax benefit associated with the loss carryforwards	$ 18,113	$ 12,757
Tax credit carryforward, expiration period	20 years
Deferred tax asset, loss carryforwards	$ 45,700
NJRCEV
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	74,000	22,100
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating losses	78,700
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 310,600
Net operating losses, life	20 years
Valuation allowance	$ 262	$ 176
Deferred tax asset, loss carryforwards	119,684
State and Local Jurisdiction | Fiscal years 2017 - 2021
Operating Loss Carryforwards [Line Items]
Deferred tax asset, loss carryforwards	0
State and Local Jurisdiction | Fiscal years 2022 - 2026
Operating Loss Carryforwards [Line Items]
Deferred tax asset, loss carryforwards	0
State and Local Jurisdiction | Fiscal years 2027 - 2031
Operating Loss Carryforwards [Line Items]
Deferred tax asset, loss carryforwards	835
State and Local Jurisdiction | Fiscal years 2032 - 2036
Operating Loss Carryforwards [Line Items]
Deferred tax asset, loss carryforwards	$ 118,849