Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2017	Oct. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 1,134,761	$ 1,068,428
Accumulated Amortization	860,152	801,767
Net Assets	274,609	266,661
Core/developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Assets	622,979	610,812
Accumulated Amortization	495,488	460,722
Net Assets	127,491	150,090
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Assets	276,756	235,997
Accumulated Amortization	153,598	139,932
Net Assets	123,158	96,065
Contract rights intangible
Finite-Lived Intangible Assets [Line Items]
Gross Assets	173,589	171,248
Accumulated Amortization	168,332	162,183
Net Assets	5,257	9,065
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Assets	25,129	20,729
Accumulated Amortization	15,659	13,821
Net Assets	9,470	6,908
In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	4,600
Accumulated Amortization	0
Net Assets	4,600
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Assets	31,708	29,642
Accumulated Amortization	27,075	25,109
Net Assets	$ 4,633	$ 4,533