Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 17, 2025	Oct. 31, 2025	Oct. 31, 2024
Goodwill [Roll Forward]
Beginning Balance		$ 3,448,850	$ 3,346,065
Additions		23,442,889	96,142
Adjustments		(19,471)	170
Effect of foreign currency translation		26,947	6,473
Ending balance		26,899,215	3,448,850
Ansys, Inc
Goodwill [Roll Forward]
Additions	$ 23,400,000
Ending balance	$ 23,442,889
Design Automation
Goodwill [Roll Forward]
Beginning Balance		2,469,257	2,400,682
Additions		23,442,889	61,803
Adjustments		(19,471)	170
Effect of foreign currency translation		24,255	6,602
Ending balance		25,916,930	2,469,257
Design IP
Goodwill [Roll Forward]
Beginning Balance		979,593	945,383
Additions		0	34,339
Adjustments		0	0
Effect of foreign currency translation		2,692	(129)
Ending balance		$ 982,285	$ 979,593