Business Combinations (Details)		3 Months Ended	12 Months Ended
	Jun. 22, 2022 USD ($)	Apr. 30, 2022 USD ($)	Oct. 31, 2023 USD ($)	Oct. 31, 2022 USD ($) acquisition	Oct. 31, 2021 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 4,070,336,000	$ 3,842,234,000	$ 3,575,785,000
Redeemable non-controlling interest			31,043,000	38,664,000
Acquisition-related costs			$ 15,100,000	14,100,000	15,400,000
OpenLight
Business Acquisition [Line Items]
Ownership percentage			73.00%
Design Automation
Business Acquisition [Line Items]
Goodwill			$ 2,400,682,000	2,176,337,000	2,156,732,000
Design IP
Business Acquisition [Line Items]
Goodwill			945,383,000	944,734,000	947,742,000
Software Integrity
Business Acquisition [Line Items]
Goodwill			724,271,000	721,163,000	471,311,000
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Total purchase consideration			295,400,000	31,800,000	298,900,000
Identifiable intangible assets			95,800,000	12,700,000	109,300,000
Goodwill					205,800,000
Net tangible liabilities			29,800,000	3,100,000	16,200,000
Goodwill, expected tax deductible amount			5,700,000	$ 0	34,000,000
Number of acquisitions | acquisition				2
Series of Individually Immaterial Business Acquisitions | Design Automation
Business Acquisition [Line Items]
Goodwill			$ 229,400,000	$ 22,200,000	150,400,000
Series of Individually Immaterial Business Acquisitions | Design IP
Business Acquisition [Line Items]
Goodwill					9,700,000
Series of Individually Immaterial Business Acquisitions | Software Integrity
Business Acquisition [Line Items]
Goodwill					$ 45,700,000
Series of Individually Immaterial Business Acquisitions | Minimum
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			1 year
Series of Individually Immaterial Business Acquisitions | Maximum
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			8 years
NTT Security AppSec Solutions Inc
Business Acquisition [Line Items]
Total purchase consideration	$ 310,000,000
Identifiable intangible assets	97,500,000
Net tangible liabilities	40,400,000
Goodwill, expected tax deductible amount	0
NTT Security AppSec Solutions Inc | Software Integrity
Business Acquisition [Line Items]
Goodwill	$ 252,900,000
NTT Security AppSec Solutions Inc | Minimum
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	5 years
NTT Security AppSec Solutions Inc | Maximum
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	10 years
OpenLight
Business Acquisition [Line Items]
Total purchase consideration		$ 90,000,000
Identifiable intangible assets		94,000,000
Goodwill, expected tax deductible amount		$ 0
Percent of company acquired		75.00%
Percentage of equity interests held by non-controlling interest		25.00%
Redeemable noncontrolling interest, redemption value		$ 30,000,000
Redeemable noncontrolling interest, put option value		10,100,000
Consideration transferred including redeemable noncontrolling interest		100,100,000
Net loss of acquiree			$ 40,900,000
Net loss of acquiree attributable to redeemable non-controlling interest			10,000,000
Redeemable non-controlling interest			$ 31,000,000
OpenLight | Design Automation
Business Acquisition [Line Items]
Goodwill		$ 46,700,000