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	Jun. 30, 2012	Sep. 30, 2011
Summary of Derivative Instruments by Risk Exposure [Line Items]
Total derivative contracts, net	$ 2,716	$ 1,619
Accrued Liabilities [Member]
Summary of Derivative Instruments by Risk Exposure [Line Items]
Total derivative contracts, net	1,481	988
Other Long-Term Liabilities [Member]
Summary of Derivative Instruments by Risk Exposure [Line Items]
Total derivative contracts, net	$ 1,235	$ 631