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Revenue - Schedule of Disaggregation of Revenue (Details) - Operating Segments - Revenues
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Disaggregation of Revenue [Line Items]      
Revenue percentage by product group 100.00% 100.00% 100.00%
EDA      
Disaggregation of Revenue [Line Items]      
Revenue percentage by product group 57.00% 59.00% 62.00%
IP & System Integration      
Disaggregation of Revenue [Line Items]      
Revenue percentage by product group 33.00% 31.00% 29.00%
Software Integrity Products & Services      
Disaggregation of Revenue [Line Items]      
Revenue percentage by product group 10.00% 10.00% 9.00%
Other      
Disaggregation of Revenue [Line Items]      
Revenue percentage by product group [1] 0.00% 0.00% 0.00%
[1]
The percentage of revenue by Other is less than 1%.