Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Oct. 31, 2019 USD ($) chief_executive_officer Segment	Oct. 31, 2018 USD ($) Segment	Oct. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of reportable operating segment | Segment	2	1
Number of chief executive officers | chief_executive_officer	2
Cash and cash equivalent maturity period, months	3 months
Depreciation expenses	$ 100,400,000	$ 72,800,000	$ 82,800,000
Repair and maintenance costs	52,500,000	45,700,000	40,600,000
Goodwill impairment loss	0	0	0
Long-lived assets impairment loss	0	0	0
Restructuring charges	47,186,000	12,945,000	36,586,000
Retained earnings	3,164,144,000	2,543,688,000
Unbilled receivables	38,175,000	36,699,000
Contract with customer, asset, net	210,557,000	126,897,000
Contract with customer, liability	1,302,578,000	1,104,110,000
Capitalized contract cost, net	86,400,000
Deferred tax liabilities, net	78,384,000	73,205,000
Contract with customer, liability, revenue recognized	1,000,000,000
Revenue, remaining performance obligation, amount	4,400,000,000
Revenue, remaining performance obligation, non-cancellable, amount	$ 494,300,000
Revenue, remaining performance obligation, excluding non-cancellable, recognized over twelve month period, percent	56.00%
Capitalized contract cost, amortization	$ 62,800,000
Software product warranty period (in days)	90 days
Sales Based Royalties
Summary Of Significant Accounting Policies [Line Items]
Contract with customer, liability, revenue recognized	$ 80,000,000.0
Maximum
Summary Of Significant Accounting Policies [Line Items]
Hardware product warranty period (in months)	6 months
2019 Restructuring | Minimum
Summary Of Significant Accounting Policies [Line Items]
Restructuring charges	$ 56,000,000
2019 Restructuring | Maximum
Summary Of Significant Accounting Policies [Line Items]
Restructuring charges	65,000,000
Employee Severance and Benefits | 2019 Restructuring
Summary Of Significant Accounting Policies [Line Items]
Restructuring charges	47,200,000
Payments for restructuring charges	24,600,000
Restructuring reserve	$ 22,600,000
Employee Severance and Benefits | 2018 Restructuring
Summary Of Significant Accounting Policies [Line Items]
Restructuring charges		12,900,000
Restructuring reserve		8,100,000
Employee Severance and Benefits | 2017 Restructuring
Summary Of Significant Accounting Policies [Line Items]
Restructuring charges			36,600,000
Restructuring reserve			$ 17,500,000
Intangible Assets | Minimum
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortization period	1 year
Intangible Assets | Maximum
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortization period	10 years
Accounting Standards Update 2014-09 | Adjustments
Summary Of Significant Accounting Policies [Line Items]
Restructuring charges	$ 0
Retained earnings	$ (345,747,000)	265,100,000
Unbilled receivables		(27,400,000)
Contract with customer, asset, net		126,900,000
Contract with customer, liability		(165,600,000)
Capitalized contract cost, net		73,800,000
Deferred tax liabilities, net		$ 81,400,000