Subsequent Events (Schedule Of Restricted Units Granted) (Details) (Subsequent Event [Member], Restricted Stock Units [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011
Performance-based Award [Member]
Subsequent Event [Line Items]
Number Granted	408
Intrinsic Value	$ 8,577
Time-based Award [Member]
Subsequent Event [Line Items]
Number Granted	805
Intrinsic Value	$ 16,929