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Fair Value Measurements and Interest Rate Swaps (Details 2) (Accrued Expenses and Other Current Liabilities [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Accrued Expenses and Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Estimated fair value, liability for interest rate swaps	$ (3,650)	$ (1,104)

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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