Summary Of Significant Accounting Policies (Deferred Revenue) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 336,913	$ 327,529
Deferred Maintenance Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	312,721	306,940
Deferred Other Service Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	18,793	14,127
Deferred License Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 5,399	$ 6,462