Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2018	Oct. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 1,395,791	$ 1,166,198
Accumulated Amortization	973,596	912,355
Net Assets	422,195	253,843
Core/developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Assets	767,764	647,975
Accumulated Amortization	563,097	526,796
Net Assets	204,667	121,179
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Assets	358,090	278,811
Accumulated Amortization	185,128	166,886
Net Assets	172,962	111,925
Contract rights intangible
Finite-Lived Intangible Assets [Line Items]
Gross Assets	184,180	174,615
Accumulated Amortization	174,861	172,178
Net Assets	9,319	2,437
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Assets	42,929	25,329
Accumulated Amortization	19,599	17,401
Net Assets	23,330	7,928
In Process Research and Development
Finite-Lived Intangible Assets [Line Items]
Gross Assets	8,200	6,600
Accumulated Amortization	0	0
Net Assets	8,200	6,600
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Assets	34,628	32,868
Accumulated Amortization	30,911	29,094
Net Assets	$ 3,717	$ 3,774