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Financial Instruments Cost and Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2015
Jan. 31, 2015
Apr. 30, 2014
Jan. 31, 2014
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents $ 1,182.7us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,410.6us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,609.6us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,853.0us-gaap_CashAndCashEquivalentsAtCarryingValue
Total 1,053.9us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis      
Derivative contracts, Amortized Cost 7.5adsk_DerivativeInstrumentsAndHedgesCarryingAmount [1] 3.5adsk_DerivativeInstrumentsAndHedgesCarryingAmount [1]    
Derivative contracts, Gross unrealized gains 12.4adsk_DerivativeAssetsAccumulatedGrossUnrealizedGainbeforeTax [1] 19.5adsk_DerivativeAssetsAccumulatedGrossUnrealizedGainbeforeTax [1]    
Derivative contracts, Gross unrealized losses (8.8)adsk_DerivativeAssetsAccumulatedGrossUnrealizedLossbeforeTax [1] (7.0)adsk_DerivativeAssetsAccumulatedGrossUnrealizedLossbeforeTax [1]    
Derivative contracts, Fair Value 11.1us-gaap_DerivativeAssets [1] 16.0us-gaap_DerivativeAssets [1]    
Amortized Cost 1,643.0adsk_AmortizedCostSecurities 1,592.6adsk_AmortizedCostSecurities    
Gross unrealized gains 20.8adsk_InvestmentsAccumulatedGrossUnrealizedGainbeforeTax 26.6adsk_InvestmentsAccumulatedGrossUnrealizedGainbeforeTax    
Gross unrealized losses (11.1)adsk_InvestmentsAccumulatedGrossUnrealizedLossbeforeTax (9.4)adsk_InvestmentsAccumulatedGrossUnrealizedLossbeforeTax    
Fair Value 1,652.7adsk_FairValueAssetsMeasuredOnRecurringBasis 1,609.8adsk_FairValueAssetsMeasuredOnRecurringBasis    
Short-term available-for-sale        
Schedule of Available-for-sale Securities [Line Items]        
Mutual funds, Amortized Cost 40.1us-gaap_TradingSecuritiesShortTermInvestmentsAmortizedCost
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Mutual funds, Gross unrealized gains 4.4adsk_TradingSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
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Mutual funds, Fair Value 44.5us-gaap_TradingSecurities
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Short-term available-for-sale | U.S. government agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 43.8us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Short-term available-for-sale | Corporate debt securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 149.0us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Short-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 18.9us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Short-term available-for-sale | Certificate of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 151.6us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Short-term available-for-sale | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 229.3us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Short-term available-for-sale | U.S. treasury bills        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 11.1us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Long-term available-for-sale | U.S. government agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 64.8us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Long-term available-for-sale | Corporate debt securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 266.5us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Schedule of Available-for-sale Securities [Line Items]        
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Long-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
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[1] Included in “Prepaid expenses and other current assets,” “Other assets,” or “Other accrued liabilities” in the accompanying Condensed Consolidated Balance Sheets.
[2] Considered “available-for-sale” and included in “Other assets” in the accompanying Condensed Consolidated Balance Sheets.
[3] Included in “Cash and cash equivalents” in the accompanying Condensed Consolidated Balance Sheets.