FAIR VALUE, DEBT (Details) (USD $)	Jun. 30, 2011	Sep. 30, 2010
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 440,424,000	$ 460,182,000
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 466,496,627	$ 495,035,000