INTEREST RATE SWAPS (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 30, 2012 interest_rate_swap_agreement	Sep. 30, 2011	Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swap agreements	5
Notional value, interest rate swap agreements	$ 50,000,000
Loss on interest rate cash flow hedge ineffectiveness	400,000	0	0
Line of Credit [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Credit facility outstanding	250,000,000
Interest Rate Swap [Member] | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in other comprehensive income (loss)	1,500,000
Loss recognized in income		1,500,000
Interest Rate Swap [Member] | Interest Expense [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in other comprehensive income (loss)	1,200,000
Loss recognized in income		400,000
3.4% Interest Rate Swaps Due 2014 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swap agreements	5
Notional value, interest rate swap agreements	$ 50,000,000
Interest rate fixed as result of interest rate swap hedges	3.40%