Employee Benefit Plans - Other Retirement Plans (Details)	12 Months Ended
	Oct. 31, 2025 USD ($)	Oct. 31, 2025 CAD ($)	Oct. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)
Other Retirement Plans [Line Items]
Deferred percentage of annual cash base compensation	50.00%	50.00%
Deferred percentage of variable cash compensation	100.00%	100.00%
Maximum pretax annual company contribution match per employee		$ 4,000
Other Retirement Plans, Defined Contribution Plan
Other Retirement Plans [Line Items]
Employer contribution	$ 80,700,000		$ 51,300,000	$ 50,800,000
Maximum pretax annual company contribution match per employee	$ 7,500
Other Retirement Plans, Defined, Contribution Plan, Legacy Ansys Employees
Other Retirement Plans [Line Items]
Employer matching contribution, percent of employees' pay	4.25%	4.25%