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Taxes - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2016 | Apr. 30, 2017 | Apr. 30, 2016 | Jan. 31, 2016 | Apr. 30, 2017 | Nov. 01, 2016
Taxes [Line Items] |  |  |  |  |  |
Statutory federal income tax rate |  | 35.00% |  |  | 35.00% |
Long-term deferred income taxes | $ 281,926,000 | $ 367,000,000 |  |  | $ 367,000,000 |
Share-based compensation, excess tax benefit, amount |  | 8,300,000 |  |  | 11,300,000 |
Fiscal year 2011, 2010, and 2009 | California Franchise Tax Board |  |  |  |  |  |
Taxes [Line Items] |  |  |  |  |  |
Reduction in deferred tax asset due to tax settlement |  |  |  | $ 4,900,000 |  |
Unrecognized tax benefits decrease resulting from settlement |  |  |  | 10,300,000 |  |
Deferred tax asset, increase (decrease), amount |  |  |  | $ 5,400,000 |  |
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 |  | $ 31,000,000 |  |  | $ 31,000,000 |
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect |  |  |  |  |  |
Taxes [Line Items] |  |  |  |  |  |
Long-term deferred income taxes |  |  |  |  |  | $ 106,500,000
Retained Earnings | Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect |  |  |  |  |  |
Taxes [Line Items] |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  |  | $ 106,500,000
India Taxing Authority | Fiscal years 2010 to 2015 |  |  |  |  |  |
Taxes [Line Items] |  |  |  |  |  |
Tax adjustments, settlements, and unusual provisions |  |  | $ 2,400,000 |  |  |
Synopsys Hungary | Foreign Tax Authority | Tax Year 2011 - Tax Year 2013 | Hungarian Tax Authority |  |  |  |  |  |
Taxes [Line Items] |  |  |  |  |  |
Estimate of tax assessment | 46,000,000 |  |  |  |  |
Estimate of additional penalties and interest | $ 19,000,000 |  |  |  |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31931-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31928-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31958-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31917-109318 + Details
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