Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Amount of revenue recognized from beginning deferred revenue and backlog	$ 527.9	$ 437.2

Contract with Customer, Liability, Revenue Recognized, Backlog Included

No definition available.

Name:	anss_ContractWithCustomerLiabilityRevenueRecognizedBacklogIncluded
Namespace Prefix:	anss_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration