Property And Equipment (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Property, Plant and Equipment [Abstract]
Computer hardware and software	$ 230,591,000	$ 217,724,000
Furniture and fixtures	19,025,000	19,211,000
Leasehold improvements	36,896,000	35,289,000
Gross property and equipment	286,512,000	272,224,000
Accumulated depreciation and amortization	(218,729,000)	(207,572,000)
Net property and equipment	67,783,000	64,652,000	63,466,000
Depreciation expense	$ 27,100,000	$ 31,500,000	$ 30,400,000