Subsequent Event	9 Months Ended
	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Event	Subsequent EventOn October 23, 2020, we entered into a definitive agreement to acquire 100% of the shares of AGI, a premier provider of mission-simulation, modeling, testing and analysis software for aerospace, defense and intelligence applications. Once closed, the acquisition will expand the scope of our offerings, empowering users to solve challenges by simulating from the chip level all the way to a customer's entire mission. The transaction is expected to close with a purchase price of $700.0 million, of which the AGI shareholders will receive 67% in cash and 33% in Ansys common stock. We anticipate obtaining new debt financing to fund a significant portion of the cash component of the purchase price.