Interest Rate Swaps (Fair Value Of Cash Flow Hedge Derivative Contracts Included In The Consolidated Balance Sheets) (Details) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2011
Summary of Derivative Instruments by Risk Exposure [Line Items]
Total derivative contracts, net	$ 2,753	$ 3,119
Accrued liabilities [Member]
Summary of Derivative Instruments by Risk Exposure [Line Items]
Total derivative contracts, net	1,751	1,705
Other long-term liabilities [Member]
Summary of Derivative Instruments by Risk Exposure [Line Items]
Total derivative contracts, net	$ 1,002	$ 1,414