Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
		Apr. 30, 2016		Oct. 31, 2015
Intangible Assets
Gross Carrying Value		$ 91,330		$ 74,570
Accumulated Amortization		21,719		14,057
Net Carrying Value		$ 69,611		$ 60,513
Weighted- Average Remaining Useful Life (In years)		6 years 1 month 6 days		6 years 6 months 18 days
Indefinite-Lived Intangible Assets (Excluding Goodwill)				$ 15,110
Intangible Assets, Gross (Excluding Goodwill)		$ 91,330		89,680
Intangible assets, net		69,611		75,623
Indefinite-lived Intangible Assets, Period Increase (Decrease)		15,100
CostofFullyAmortizedIntangibleAssets		$ 1,000
Minimum [Member]
Intangible Assets
UsefulLifeofCompletedIPRD		5 years
Maximum [Member]
Intangible Assets
UsefulLifeofCompletedIPRD		6 years
In Process Research and Development [Member]
Intangible Assets
Indefinite-Lived Intangible Assets (Excluding Goodwill)	[1]			15,110
Trade names
Intangible Assets
Gross Carrying Value		$ 1,090		1,090
Accumulated Amortization		527		415
Net Carrying Value		$ 563		$ 675
Weighted- Average Remaining Useful Life (In years)		4 years 1 month 17 days		4 years 4 months 10 days
Core/developed technology (1) (2)
Intangible Assets
Gross Carrying Value	[2]	$ 57,290	[1]	$ 40,530
Accumulated Amortization	[2]	14,912	[1]	9,605
Net Carrying Value	[2]	$ 42,378	[1]	$ 30,925
Weighted- Average Remaining Useful Life (In years)	[2]	4 years	[1]	3 years 5 months 26 days
Patent portfolio license (3)
Intangible Assets
Gross Carrying Value	[3]	$ 7,750		$ 7,750
Accumulated Amortization	[3]	1,399		849
Net Carrying Value	[3]	$ 6,351		$ 6,901
Weighted- Average Remaining Useful Life (In years)	[3]	17 years 5 months 26 days		17 years 8 months 26 days
Customer relationships
Intangible Assets
Gross Carrying Value		$ 23,110		$ 23,110
Accumulated Amortization		3,982		2,484
Net Carrying Value		$ 19,128		$ 20,626
Weighted- Average Remaining Useful Life (In years)		6 years 8 months 16 days		7 years 2 months 5 days
Non-compete agreements
Intangible Assets
Gross Carrying Value		$ 1,050		$ 1,050
Accumulated Amortization		824		664
Net Carrying Value		$ 226		$ 386
Weighted- Average Remaining Useful Life (In years)		8 months 8 days		1 year 2 months 1 day
Patents with broader applications
Intangible Assets
Gross Carrying Value		$ 1,040		$ 1,040
Accumulated Amortization		75		40
Net Carrying Value		$ 965		$ 1,000
Weighted- Average Remaining Useful Life (In years)		13 years 10 months 17 days		14 years 4 months 17 days

[1] Acquired IPR&D are intangible assets accounted for as indefinite-lived assets until the completion or abandonment of the associated research and development efforts. If the research and development efforts associated with the IPR&D are successfully completed, then the IPR&D intangible assets will be amortized over the estimated useful lives to be determined as of the date the efforts are completed. During the six months ended April 30, 2016, research and development efforts were completed on $15.1 million of the IPR&D intangible assets, and the completed IPR&D intangible assets are being amortized as Core/developed technology over the respective estimated useful lives of five and six years.

[2] During the six months ended April 30, 2016, $1.0 million of finite-lived intangible assets became fully amortized and, therefore, were removed from the balance sheet.

[3] The patent portfolio license was assigned an estimated useful life that reflects the Company’s consumption of the expected defensive benefits related to this license to certain patents. The method of amortization for the patent portfolio license reflects the Company’s estimate of the pattern in which these expected defensive benefits will be used by the Company and is primarily based on the mix of expiration patterns of the individual patents included in the license.