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Financial Instruments - Fair Value of Derivative Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2015
Jan. 31, 2014
Derivatives, Fair Value [Line Items]    
Notional amount of foreign currency forward contracts not designated as cash flow hedges $ 336.6invest_DerivativeNotionalAmount $ 351.7invest_DerivativeNotionalAmount
Derivative asset, net 21.3us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 21.3us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Derivative liability, net 5.4us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 1.7us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Foreign Exchange Contracts    
Derivatives, Fair Value [Line Items]    
Notional amount of foreign currency forward contracts not designated as cash flow hedges 44.6invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 205.5invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
Designated as Hedging Instrument | Foreign Exchange Contracts | Prepaid expenses and other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, net 20.4us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [1] 4.4us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [1]
Derivative asset, gross 23.8us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 5.9us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, net 5.4us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= adsk_OtherAccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [2] 1.7us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= adsk_OtherAccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 [2]
Derivative liability, gross 8.7us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= adsk_OtherAccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 3.2us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= adsk_OtherAccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Not Designated as Hedging Instrument | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, net $ 0.9us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ 16.9us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[1] Considering Autodesk's master netting arrangements, these contracts are presented net settled. The gross balance is $23.8 million and $5.9 million at January 31, 2015 and January 31, 2014, respectively.
[2] Considering Autodesk's master netting arrangements, these contracts are presented net settled. The gross balance is $8.7 million and $3.2 million at January 31, 2015 and January 31, 2014, respectively.