Balance Sheet Details (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 114,239	$ 63,126
Accumulated Amortization	(46,108)	(41,848)
Net Carrying Amount	68,131	21,278
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	99,463	54,240
Accumulated Amortization	(40,010)	(36,111)
Net Carrying Amount	59,453	18,129
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,399	5,379
Accumulated Amortization	(3,123)	(2,855)
Net Carrying Amount	5,276	2,524
Patents And Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,044	3,044
Accumulated Amortization	(2,525)	(2,464)
Net Carrying Amount	519	580
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,173	263
Accumulated Amortization	(250)	(218)
Net Carrying Amount	923	45
Non-Compete Covenants [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,160	200
Accumulated Amortization	(200)	(200)
Net Carrying Amount	$ 1,960	$ 0