Derivative Instruments and Hedging Activities (Details 2) (Borrowings [Member], Fair Value Hedging [Member], Other Income Expense [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Borrowings [Member] | Fair Value Hedging [Member] | Other Income Expense [Member]
Interest Rate Fair Value Hedges [Abstract]
Gain/(Loss) on the hedged fixed rate debt attributable to changes in the market interest rates	$ 975	$ (607)	$ 2,707	$ 2,164