Revenue - Schedule of Disaggregation of Revenue (Details) - Product Concentration Risk - Revenue	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue percentage by product group	100.00%	100.00%	100.00%	100.00%
EDA
Disaggregation of Revenue [Line Items]
Revenue percentage by product group	55.80%	55.20%	56.20%	57.70%
IP & System Integration
Disaggregation of Revenue [Line Items]
Revenue percentage by product group	34.40%	34.80%	34.20%	32.00%
Software Integrity Products & Services
Disaggregation of Revenue [Line Items]
Revenue percentage by product group	9.30%	9.70%	9.30%	10.00%
Other
Disaggregation of Revenue [Line Items]
Revenue percentage by product group	0.50%	0.30%	0.30%	0.30%