ASSET RETIREMENT OBLIGATIONS (ARO) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at October 1	$ 27,983	$ 27,026
Accretion	1,892	1,774
Additions	533	380
Retirements	(1,697)	(1,197)
Balance at period end	28,711	27,983
Future Accretion [Abstract]
2014	1,975
2015	2,037
2016	2,099
2017	2,152
2018	2,204
Total	$ 10,467