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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2014
Oct. 31, 2013
Deferred Tax Assets, Gross [Abstract]    
Accruals and reserves $ 28,608us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals $ 35,548us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Deferred revenue 42,766us-gaap_DeferredTaxAssetsDeferredIncome 36,551us-gaap_DeferredTaxAssetsDeferredIncome
Deferred compensation 56,920us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 45,662us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Capitalized costs 66,616snps_DeferredTaxAssetsCapitalizedCosts 84,390snps_DeferredTaxAssetsCapitalizedCosts
Capitalized research and development costs 32,710snps_DeferredTaxAssetsCapitalizedResearchAndDevelopmentCosts 36,650snps_DeferredTaxAssetsCapitalizedResearchAndDevelopmentCosts
Stock compensation 18,508us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 16,790us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Tax loss carryovers 64,273us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 63,869us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Foreign tax credit carryovers 18,846us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 13,961us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Research and other tax credit carryovers 110,247us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 108,044us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Other 4,689us-gaap_DeferredTaxAssetsOther 3,736us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets 444,183us-gaap_DeferredTaxAssetsGross 445,201us-gaap_DeferredTaxAssetsGross
Valuation allowance (45,996)us-gaap_DeferredTaxAssetsValuationAllowance (43,374)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 398,187us-gaap_DeferredTaxAssetsNet 401,827us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Gross [Abstract]    
Intangible assets 81,218us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 82,662us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Undistributed earnings of foreign subsidiaries 726us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 11,982us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Total deferred tax liabilities 81,944us-gaap_DeferredTaxLiabilities 94,644us-gaap_DeferredTaxLiabilities
Net deferred tax assets $ 316,243us-gaap_DeferredTaxAssetsLiabilitiesNet $ 307,183us-gaap_DeferredTaxAssetsLiabilitiesNet