Fair Value Measurements (Details) (Interest Rate Swap Agreements [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Fair Value of Assets and Liabilities
Fair Value of Assets and Liabilities	$ (6,088)	$ (6,744)
Quoted Market Prices (Level 1) [Member]
Fair Value of Assets and Liabilities
Fair Value of Assets and Liabilities
Significant Other Observable Inputs (Level 2) [Member]
Fair Value of Assets and Liabilities
Fair Value of Assets and Liabilities	(6,088)	(6,744)
Significant Unobservable Inputs (level 3) [Member]
Fair Value of Assets and Liabilities
Fair Value of Assets and Liabilities