Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Oct. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 1,058,549	$ 1,030,594
Accumulated Amortization	738,473	666,935
Net Assets	320,076	363,659	[1]
Core/developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Assets	604,463	584,293
Accumulated Amortization	419,254	375,395
Net Assets	185,209	208,898
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Assets	235,697	231,908
Accumulated Amortization	127,603	115,170
Net Assets	108,094	116,738
Contract rights intangible
Finite-Lived Intangible Assets [Line Items]
Gross Assets	167,647	165,623
Accumulated Amortization	153,590	141,763
Net Assets	14,057	23,860
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	20,729	20,729
Accumulated Amortization	12,248	10,665
Net Assets	8,481	10,064
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Assets	27,483	25,511
Accumulated Amortization	23,248	21,412
Net Assets	$ 4,235	$ 4,099

[1] Derived from audited financial statements.