Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2019	Oct. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 1,397,054	$ 1,395,571
Accumulated Amortization	1,090,127	1,035,167
Net Assets	306,927	360,404
Core/developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Assets	773,147	773,147
Accumulated Amortization	629,360	598,956
Net Assets	143,787	174,191
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Assets	358,522	358,524
Accumulated Amortization	223,374	204,382
Net Assets	135,148	154,142
Contract rights intangible
Finite-Lived Intangible Assets [Line Items]
Gross Assets	183,947	183,953
Accumulated Amortization	179,167	177,191
Net Assets	4,780	6,762
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Assets	42,929	42,929
Accumulated Amortization	24,025	21,944
Net Assets	18,904	20,985
In Process Research and Development
Finite-Lived Intangible Assets [Line Items]
Gross Assets	1,200	1,200
Accumulated Amortization	0	0
Net Assets	1,200	1,200
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Assets	37,309	35,818
Accumulated Amortization	34,201	32,694
Net Assets	$ 3,108	$ 3,124