Income Taxes (Schedule Of Tax Effects To Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Net operating loss carry-forwards	$ 10,072	$ 1,366
Allowance for doubtful accounts	1,112	1,106
Accrued compensation and benefits	7,272	6,371
Inventories and related reserves	1,120	1,223
Stock-based compensation	5,933	11,713
Deferred revenue	26,277	23,372
Other accruals and reserves	10,131	9,594
Tax credit carry-forwards	2,122	793
Total deferred tax assets before deferred liabilities	64,039	55,538
Valuation allowance	(5,390)	(208)
Deferred tax assets, net of valuation allowance	58,649	55,330
Purchased intangibles and other	(21,567)	(6,329)
Depreciation	(3,697)	(3,161)
Total deferred tax liabilities	(25,264)	(9,490)
Net deferred tax assets	$ 33,385	$ 45,840