Goodwill and Intangible Assets - Amortization Expense Related to Intangible Assets (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets		$ 25,028	$ 25,932	$ 48,462	$ 54,931
Core/developed technology
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets		12,724	14,045	25,042	30,404
Customer relationships
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets		8,912	9,377	17,474	18,957
Contract rights intangible
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets		1,681	866	2,557	1,982
Trademarks and trade names
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets		778	909	1,555	2,081
Capitalized software development costs
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets	[1]	$ 933	$ 735	$ 1,834	$ 1,507

[1] Amortization of capitalized software development costs is included in cost of products revenue in the unaudited condensed consolidated statements of operations.