Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2013	Mar. 31, 2013 Total Accumulated Other Comprehensive (Loss) Earnings [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2012 Total Accumulated Other Comprehensive (Loss) Earnings [Member] Designated as Hedging Instrument [Member]
Unrecognized loss		$ 521	$ 607
Net unrecognized losses on terminated derivative instruments expected to be reclassified to earnings	$ 171
Term of gain or loss recognition in interest expense on terminated derivatives recorded in OCI	1 year

Estimated period for the anticipated transfer of gain (loss), net, from accumulated other comprehensive income into earnings, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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