Summary of Significant Accounting Policies and Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Jul. 17, 2025 USD ($) $ / shares	Oct. 31, 2025 USD ($) reporting_unit	Oct. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)
Accounting Policies [Abstract]
Fiscal period duration		363 days	371 days	364 days
Business Combination [Line Items]
Software product warranty period (in days)		90 days
Hardware product warranty period, up to (in months)		6 months
Cash and cash equivalent maturity period, months		3 months
Debt securities and other investments, minimum short term maturity, period		3 months
Debt securities and other investments, maximum maturity, period		3 years
Depreciation expenses		$ 171,900	$ 162,900	$ 141,400
Repair and maintenance costs		$ 104,700	$ 89,400	$ 74,400
Number of reporting units | reporting_unit		2
Minimum
Business Combination [Line Items]
Definite lived intangible asset amortization period		1 year
Maximum
Business Combination [Line Items]
Definite lived intangible asset amortization period		23 years
Ansys, Inc
Business Combination [Line Items]
Business acquisition, share price (in USD per share) | $ / shares	$ 199.91
Business acquisition, exchange ratio	0.3399
Total purchase consideration	$ 34,858,480