Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jul. 31, 2018	Oct. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 1,399,653	$ 1,166,198
Accumulated Amortization	1,005,168	912,355
Net Assets	394,485	253,843
Core/developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Assets	772,014	647,975
Accumulated Amortization	581,789	526,796
Net Assets	190,225	121,179
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Assets	358,022	278,811
Accumulated Amortization	194,758	166,886
Net Assets	163,264	111,925
Contract rights intangible
Finite-Lived Intangible Assets [Line Items]
Gross Assets	184,006	174,615
Accumulated Amortization	176,045	172,178
Net Assets	7,961	2,437
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Assets	42,929	25,329
Accumulated Amortization	20,771	17,401
Net Assets	22,158	7,928
In Process Research and Development
Finite-Lived Intangible Assets [Line Items]
Gross Assets	7,100	6,600
Accumulated Amortization	0	0
Net Assets	7,100	6,600
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Assets	35,582	32,868
Accumulated Amortization	31,805	29,094
Net Assets	$ 3,777	$ 3,774