Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015		Oct. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 896,177		$ 893,002
Accumulated Amortization	593,521		527,972
Net Assets	302,656		365,030	[1]
Core/developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Assets	493,218		490,242
Accumulated Amortization	334,522		298,705
Net Assets	158,696		191,537
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Assets	209,975		210,172
Accumulated Amortization	103,540		92,146
Net Assets	106,435		118,026
Contract rights intangible
Finite-Lived Intangible Assets [Line Items]
Gross Assets	145,581		146,364
Accumulated Amortization	124,190		109,067
Net Assets	21,391		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	18,779		18,779
Accumulated Amortization	9,163		7,765
Net Assets	9,616		11,014
In-process research and development (IPR&D)
Finite-Lived Intangible Assets [Line Items]
Gross Assets	2,400	[2]	3,086	[2]
Accumulated Amortization	0	[2]	0	[2]
Net Assets	2,400	[2]	3,086	[2]
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Assets	23,694		21,829
Accumulated Amortization	19,576		17,759
Net Assets	$ 4,118		$ 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.