Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands		Jul. 31, 2015	Oct. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Assets		$ 945,714	$ 893,002
Accumulated Amortization		627,215	527,972
Net Assets		318,499	365,030	[1]
Core/developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Assets		540,740	490,242
Accumulated Amortization		353,469	298,705
Net Assets		187,271	191,537
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Assets		211,611	210,172
Accumulated Amortization		108,957	92,146
Net Assets		102,654	118,026
Contract rights intangible
Finite-Lived Intangible Assets [Line Items]
Gross Assets		147,127	146,364
Accumulated Amortization		131,895	109,067
Net Assets		15,232	37,297
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Assets		2,530	2,530
Accumulated Amortization		2,530	2,530
Net Assets		0	0
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Assets		19,079	18,779
Accumulated Amortization		9,872	7,765
Net Assets		9,207	11,014
In-process research and development (IPR&D)
Finite-Lived Intangible Assets [Line Items]
Gross Assets	[2]	0	3,086
Accumulated Amortization	[2]	0	0
Net Assets	[2]	0	3,086
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Assets		24,627	21,829
Accumulated Amortization		20,492	17,759
Net Assets		$ 4,135	$ 4,070

[1] Derived from audited financial statements.

[2] IPR&D is reclassified to core/developed technology upon completion or is written off upon abandonment.