INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate		10.30%	24.30%
Excess tax benefits associated with vesting of share-based awards	$ 41	$ 1,700
Actual effective tax rate since tax effects of awards are treated as discrete item		8.90%
Operating Loss Carryforwards [Line Items]
Forecasted tax credits, net of deferred tax					$ 24,900
Tax benefit associated with the loss carryforwards	13,100	$ 13,100			$ 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	224,200	$ 224,200			218,100
Net operating loss carryforwards, expiration term		20 years
Valuation allowance	$ 267	$ 267			$ 176
Scenario, Forecast [Member]
Operating Loss Carryforwards [Line Items]
Forecasted tax credits, net of deferred tax				$ 27,700