Summary Of Significant Accounting Policies (Deferred Revenue) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 413,657	$ 386,850
Deferred Subscription Revenue Member [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	102,847	37,478
Deferred Support Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	297,684	331,793
Deferred Professional Service Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	8,975	12,639
Deferred License and Subscription Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 4,151	$ 4,940