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Derivative Instruments - Derivative Narrative (Details) (USD $)
12 Months Ended
Sep. 30, 2012
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Sep. 30, 2011
Interest Rate Swap [Member]
Not Designated as Hedging Instrument [Member]
July 2011 Maturity [Member]
Mar. 31, 2011
Interest Rate Swap [Member]
Not Designated as Hedging Instrument [Member]
Q1 2011 Maturity [Member]
Dec. 31, 2011
Interest Rate Swap [Member]
Not Designated as Hedging Instrument [Member]
Interest Expense [Member]
Derivative [Line Items]        
Notional Amount of Cash Flow Hedge Instruments $ 100,000,000      
Derivative, Fixed Interest Rate 1.80%      
Notional Amount of Other Derivatives Not Designated as Hedging Instruments   125,000,000 75,000,000  
Derivative Instruments Not Designated as Hedging Instruments, Loss       $ 10,000