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Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue (Details) | 3 Months Ended
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Jan. 31, 2019 | Jan. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue percentage by product group | 100.00% | 100.00%
EDA |  |
Disaggregation of Revenue [Line Items] |  |
Revenue percentage by product group | 61.00% | 63.00%
IP & Systems Integration |  |
Disaggregation of Revenue [Line Items] |  |
Revenue percentage by product group | 29.00% | 28.00%
Software Integrity Products & Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue percentage by product group | 10.00% | 8.00%
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue percentage by product group | 0.00% | 1.00%

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