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Income Taxes - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Apr. 30, 2019 | Jul. 31, 2022
Taxes [Line Items] |  |  |
Statutory federal income tax rate |  |  | 21.00%
Minimum |  |  |
Taxes [Line Items] |  |  |
Estimated potential decrease in underlying unrecognized tax benefits |  |  | $ 0
Maximum |  |  |
Taxes [Line Items] |  |  |
Estimated potential decrease in underlying unrecognized tax benefits |  |  | $ 33,000,000
Synopsys Hungary | Foreign Tax Authority | Tax Year 2011 - Tax Year 2013 | Hungarian Tax Authority |  |  |
Taxes [Line Items] |  |  |
Aggregate tax assessment | $ 25,000,000 |  |
Estimate of additional penalties and interest | $ 11,000,000 |  |
Unrecognized tax benefits |  | $ 17,400,000 |

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