RELINQUISHMENT AGREEMENT (Details) (USD $)	0 Months Ended			3 Months Ended		9 Months Ended
	Jul. 25, 2000	Apr. 25, 2000	Jan. 01, 2000	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013	Sep. 30, 1998
RELINQUISHMENT AGREEMENT [Abstract]
Term of relinquishment agreement			15 years
Period following the end of the first three-month period after the relinquishment date upon which senior relinquishment payments start		25 days
Period following the end of the first six-month period after the relinquishment date upon which junior relinquishment payments start	25 days
Relinquishment payment rate as a percent of revenues						2.50%
Relinquishment liability				$ 44,800,000		$ 44,800,000		$ 74,400,000	$ 549,100,000
Accretion of discount to the relinquishment liability				552,000	1,243,000	1,654,000	3,730,000
Relinquishment Payments [Abstract]
Principal						29,129,000	27,951,000
Accretion of discount						2,071,000	3,927,000
Total relinquishment payments						31,200,000	31,900,000
Accrued relinquishment payments				$ 18,300,000		$ 18,300,000		$ 13,300,000