Effective Income Tax Rate Reconciliation, Tax Settlement and Tax Credit, Foreign, Amount

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Taxes [Line Items]

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jan. 31, 2024	Jul. 31, 2023	Oct. 31, 2017	May 17, 2023
Taxes [Line Items]
Statutory federal income tax rate	21.00%
Minimum
Taxes [Line Items]
Estimated potential decrease in underlying unrecognized tax benefits	$ 0.0
Maximum
Taxes [Line Items]
Estimated potential decrease in underlying unrecognized tax benefits	$ 5.4
Synopsys Hungary \| Foreign Tax Authority \| Tax Year 2011 - Tax Year 2013 \| Hungarian Tax Authority
Taxes [Line Items]
Aggregate tax assessment (refund)			$ 25.0	$ (39.1)
Estimate of additional penalties and interest			$ 11.0
Release of unrecognized tax benefit and offsetting foreign tax credits, net benefit		$ 23.8