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Financial Instruments - Cost and Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents $ 1,410.6us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,853.0us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,612.2us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,156.9us-gaap_CashAndCashEquivalentsAtCarryingValue
Derivative Instruments And Hedges at Amortized Cost 3.5adsk_DerivativeInstrumentsAndHedgesNet [1] 10.8adsk_DerivativeInstrumentsAndHedgesNet [1]    
Unrealized Gain on Foreign Currency Derivatives 19.5adsk_DerivativeAssetsAccumulatedGrossUnrealizedGainbeforeTax [1] 14.8adsk_DerivativeAssetsAccumulatedGrossUnrealizedGainbeforeTax [1]    
Unrealized Loss on Foreign Currency Derivatives (7.0)adsk_DerivativeAssetsAccumulatedGrossUnrealizedLossbeforeTax [1] (6.0)adsk_DerivativeAssetsAccumulatedGrossUnrealizedLossbeforeTax [1]    
Derivative Contracts, Fair Value 16.0adsk_DerivativeContractsFairValueDisclosure [1] 19.6adsk_DerivativeContractsFairValueDisclosure [1]    
Amortized Cost Securities 1,592.6adsk_AmortizedCostSecurities 1,545.3adsk_AmortizedCostSecurities    
Unrealized Gain on Securities 26.6adsk_SecuritiesAccumulatedGrossUnrealizedGainbeforeTax 22.4adsk_SecuritiesAccumulatedGrossUnrealizedGainbeforeTax    
Unrealized Loss on Securities (9.4)adsk_SecuritiesAccumulatedGrossUnrealizedLossbeforeTax (10.5)adsk_SecuritiesAccumulatedGrossUnrealizedLossbeforeTax    
Total 1,609.8us-gaap_AssetsFairValueDisclosure 1,557.2us-gaap_AssetsFairValueDisclosure    
Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities, Cost 36.9us-gaap_TradingSecuritiesCost
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= adsk_MarketableSecuritiesCurrentMember		 35.6us-gaap_TradingSecuritiesCost
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= adsk_MarketableSecuritiesCurrentMember		    
Trading Securities, Unrealized Holding Gain 3.4adsk_TradingSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_BalanceSheetLocationAxis
= adsk_MarketableSecuritiesCurrentMember		 3.3adsk_TradingSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ us-gaap_BalanceSheetLocationAxis
= adsk_MarketableSecuritiesCurrentMember		    
Trading Securities, Unrealized Holding Loss 0adsk_TradingSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_BalanceSheetLocationAxis
= adsk_MarketableSecuritiesCurrentMember		 0adsk_TradingSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ us-gaap_BalanceSheetLocationAxis
= adsk_MarketableSecuritiesCurrentMember		    
Trading Securities 40.3us-gaap_TradingSecurities
/ us-gaap_BalanceSheetLocationAxis
= adsk_MarketableSecuritiesCurrentMember		 38.9us-gaap_TradingSecurities
/ us-gaap_BalanceSheetLocationAxis
= adsk_MarketableSecuritiesCurrentMember		    
Other Assets        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost   21.4us-gaap_AvailableForSaleSecuritiesAmortizedCost
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= us-gaap_OtherAssetsMember		 [2]    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain   3.2us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember		 [2]    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss   (4.4)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember		 [2]    
Available-for-sale Securities, Fair Value   20.2us-gaap_AvailableForSaleSecurities
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= us-gaap_OtherAssetsMember		 [2]    
Convertible Debt Securities, Amortized Cost 4.7adsk_ConvertibleDebtSecuritiesAmortizedCost
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= us-gaap_OtherAssetsMember		 [3]      
Convertible Debt Securities, Unrealized Gains 2.5adsk_ConvertibleDebtSecuritiesUnrealizedGains
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Convertible Debt Securities, Unrealized Losses (2.1)adsk_ConvertibleDebtSecuritiesUnrealizedLosses
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Convertible Debt Securities, Fair Value 5.1adsk_ConvertibleDebtSecuritiesFairValueDisclosure
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Level 1        
Schedule of Available-for-sale Securities [Line Items]        
Derivative Contracts, Fair Value 0adsk_DerivativeContractsFairValueDisclosure
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= us-gaap_FairValueInputsLevel1Member		 [1] 0adsk_DerivativeContractsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1]    
Total 1,042.0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 521.1us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		    
Level 1 | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities 40.3us-gaap_TradingSecurities
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= adsk_MarketableSecuritiesCurrentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 38.9us-gaap_TradingSecurities
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= adsk_MarketableSecuritiesCurrentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		    
Level 1 | Other Assets        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value   0us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [2]    
Convertible Debt Securities, Fair Value 0adsk_ConvertibleDebtSecuritiesFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [3]      
Level 2        
Schedule of Available-for-sale Securities [Line Items]        
Derivative Contracts, Fair Value 15.1adsk_DerivativeContractsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1] 10.5adsk_DerivativeContractsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1]    
Total 561.8us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member		 1,006.8us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member		    
Level 2 | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities 0us-gaap_TradingSecurities
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= adsk_MarketableSecuritiesCurrentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_TradingSecurities
/ us-gaap_BalanceSheetLocationAxis
= adsk_MarketableSecuritiesCurrentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		    
Level 2 | Other Assets        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value   0us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]    
Convertible Debt Securities, Fair Value 0adsk_ConvertibleDebtSecuritiesFairValueDisclosure
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= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [3]      
Level 3        
Schedule of Available-for-sale Securities [Line Items]        
Derivative Contracts, Fair Value 0.9adsk_DerivativeContractsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1] 9.1adsk_DerivativeContractsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1]    
Total 6.0us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueInputsLevel3Member		 29.3us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueInputsLevel3Member		    
Level 3 | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities 0us-gaap_TradingSecurities
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= adsk_MarketableSecuritiesCurrentMember
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= us-gaap_FairValueInputsLevel3Member		 0us-gaap_TradingSecurities
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= adsk_MarketableSecuritiesCurrentMember
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= us-gaap_FairValueInputsLevel3Member		    
Level 3 | Other Assets        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value   20.2us-gaap_AvailableForSaleSecurities
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= us-gaap_OtherAssetsMember
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= us-gaap_FairValueInputsLevel3Member		 [2]    
Convertible Debt Securities, Fair Value 5.1adsk_ConvertibleDebtSecuritiesFairValueDisclosure
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= us-gaap_OtherAssetsMember
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Agency bond | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost 37.9us-gaap_AvailableForSaleSecuritiesAmortizedCost
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= adsk_MarketableSecuritiesCurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain 0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
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= adsk_MarketableSecuritiesCurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		 0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
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= adsk_MarketableSecuritiesCurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss 0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
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= adsk_MarketableSecuritiesCurrentMember
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= adsk_AgencyBondsMember		 0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
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= adsk_MarketableSecuritiesCurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		    
Available-for-sale Securities, Fair Value 37.9us-gaap_AvailableForSaleSecurities
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= adsk_MarketableSecuritiesCurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		 42.7us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= adsk_MarketableSecuritiesCurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		    
Agency bond | Marketable Securities, Noncurrent        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost 50.6us-gaap_AvailableForSaleSecuritiesAmortizedCost
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= adsk_AgencyBondsMember		 43.3us-gaap_AvailableForSaleSecuritiesAmortizedCost
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= adsk_MarketableSecuritiesNoncurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain 0.2us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_BalanceSheetLocationAxis
= adsk_MarketableSecuritiesNoncurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		 0.1us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_BalanceSheetLocationAxis
= adsk_MarketableSecuritiesNoncurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss 0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
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= adsk_MarketableSecuritiesNoncurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		 0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
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= adsk_MarketableSecuritiesNoncurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		    
Available-for-sale Securities, Fair Value 50.8us-gaap_AvailableForSaleSecurities
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= adsk_MarketableSecuritiesNoncurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		 43.4us-gaap_AvailableForSaleSecurities
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= adsk_MarketableSecuritiesNoncurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adsk_AgencyBondsMember		    
Agency bond | Level 1 | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value 37.9us-gaap_AvailableForSaleSecurities
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Agency bond | Level 1 | Marketable Securities, Noncurrent        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value 50.8us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel1Member
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Agency bond | Level 2 | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value 0us-gaap_AvailableForSaleSecurities
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Agency bond | Level 2 | Marketable Securities, Noncurrent        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value 0us-gaap_AvailableForSaleSecurities
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Agency bond | Level 3 | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value 0us-gaap_AvailableForSaleSecurities
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Agency bond | Level 3 | Marketable Securities, Noncurrent        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value 0us-gaap_AvailableForSaleSecurities
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Corporate debt securities | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost 148.0us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain 0.1us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
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= adsk_MarketableSecuritiesCurrentMember
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= us-gaap_CorporateDebtSecuritiesMember		      
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss (0.1)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
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Available-for-sale Securities, Fair Value 148.0us-gaap_AvailableForSaleSecurities
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= adsk_MarketableSecuritiesCurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Corporate debt securities | Marketable Securities, Noncurrent        
Schedule of Available-for-sale Securities [Line Items]        
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= adsk_MarketableSecuritiesNoncurrentMember
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Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain 0.6us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
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Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss (0.2)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Available-for-sale Securities, Fair Value 199.8us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 180.3us-gaap_AvailableForSaleSecurities
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= adsk_MarketableSecuritiesNoncurrentMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Corporate debt securities | Level 1 | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value 148.0us-gaap_AvailableForSaleSecurities
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Corporate debt securities | Level 1 | Marketable Securities, Noncurrent        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value 199.8us-gaap_AvailableForSaleSecurities
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Corporate debt securities | Level 2 | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value 0us-gaap_AvailableForSaleSecurities
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[1] Included in “Prepaid expenses and other current assets,” "Other assets," or “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.
[2] Considered "available for sale" securities and included in "Other assets" in the accompanying Consolidated Balance Sheets.
[3] Considered "available for sale" and included in "Other assets" in the accompanying Consolidated Balance Sheets.
[4] Included in “Cash and cash equivalents” in the accompanying Consolidated Balance Sheets.