Summary Of Significant Accounting Policies (Deferred Revenue) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 327,529	$ 294,324
Deferred Maintenance Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	306,940	270,075
Deferred Other Service Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	14,127	15,321
Deferred License Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 6,462	$ 8,928