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Business Combinations and Acquisition of Non-controlling interest (Other Fiscal 2014 Acquisitions) (Details) (Other 2014 Acquisitions, USD $)
12 Months Ended
Oct. 31, 2014
acquisition
Business Acquisition [Line Items]  
Number of acquisitions completed 3us-gaap_NumberOfBusinessesAcquired
Total purchase consideration $ 40,200,000us-gaap_BusinessCombinationConsiderationTransferred1
Goodwill, not deductible for tax purposes 24,000,000snps_BusinessAcquisitionPurchasePriceAllocationGoodwillNontaxDeductibleAmount
Identifiable intangibles assets acquired $ 22,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Minimum  
Business Acquisition [Line Items]  
Definite lived intangible asset amortization period 2 years
Maximum  
Business Acquisition [Line Items]  
Definite lived intangible asset amortization period 8 years