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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Summary Of Significant Accounting Policies [Line Items]      
Cash and cash equivalent maturity period, months 3 months    
Depreciation expenses $ 63,100,000us-gaap_Depreciation $ 56,700,000us-gaap_Depreciation $ 52,800,000us-gaap_Depreciation
Repair and maintenance costs 28,700,000us-gaap_CostOfPropertyRepairsAndMaintenance 26,300,000us-gaap_CostOfPropertyRepairsAndMaintenance 23,700,000us-gaap_CostOfPropertyRepairsAndMaintenance
Goodwill impairment loss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
Long-lived assets impairment loss $ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse $ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse $ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Additional maintenance perpetual license period (in years) 20 years    
Software product warranty period (in days) 90 days    
Term Licenses      
Summary Of Significant Accounting Policies [Line Items]      
License fee percentage 75.00%snps_PercentageOfPaymentOfLicenseFee
/ us-gaap_ProductOrServiceAxis
= snps_TermLicensesMember
   
Maintenance fee percentage 100.00%snps_PercentageOfPaymentOfMaintenanceFee
/ us-gaap_ProductOrServiceAxis
= snps_TermLicensesMember
   
Perpetual licenses      
Summary Of Significant Accounting Policies [Line Items]      
License fee percentage 75.00%snps_PercentageOfPaymentOfLicenseFee
/ us-gaap_ProductOrServiceAxis
= snps_PerpetualLicensesMember
   
Maintenance fee percentage 100.00%snps_PercentageOfPaymentOfMaintenanceFee
/ us-gaap_ProductOrServiceAxis
= snps_PerpetualLicensesMember
   
Perpetual And Term Licenses      
Summary Of Significant Accounting Policies [Line Items]      
License fee percentage 75.00%snps_PercentageOfPaymentOfLicenseFee
/ us-gaap_ProductOrServiceAxis
= snps_PerpetualAndTermLicensesMember
   
Maintenance fee percentage 100.00%snps_PercentageOfPaymentOfMaintenanceFee
/ us-gaap_ProductOrServiceAxis
= snps_PerpetualAndTermLicensesMember
   
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Hardware product warranty period (in months) 6 months    
Intangible Assets | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Intangible assets amortization period 2 years    
Intangible Assets | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Intangible assets amortization period 10 years