INCOME TAXES (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate	17.70%	24.90%
Forecasted tax credits, net of deferred tax	$ 27,100	$ 26,700
Operating Loss Carryforwards [Line Items]
Tax benefit associated with the loss carryforwards	13,200		$ 12,800
ITC carryforward, expiration period			20 years
NJRCEV [Member]
Operating Loss Carryforwards [Line Items]
ITC carryforward			$ 22,100
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 226,100		218,100
Net operating loss carryforwards, expiration term	20 years
Valuation allowance	$ 270		$ 176