Income Taxes (Schedule Of Tax Effects To Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Net operating loss carry-forwards	$ 8,245	$ 10,072
Allowance for doubtful accounts	1,724	1,112
Accrued compensation and benefits	8,273	7,272
Inventories and related reserves	1,139	1,120
Stock-based compensation	7,295	5,933
Deferred revenue	30,662	26,277
Other accruals and reserves	13,473	10,131
Tax credit carryforwards	2,852	2,122
Depreciation	738	0
Total deferred tax assets before deferred liabilities	74,401	64,039
Valuation allowance	(7,198)	(5,390)
Deferred tax assets, net of valuation allowance	67,203	58,649
Purchased intangibles and other	(24,108)	(21,567)
Depreciation	0	(3,697)
Total deferred tax liabilities	(24,108)	(25,264)
Net deferred tax assets	$ 43,095	$ 33,385