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Basis of Presentation Reclassification (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Reclassification [Line Items]    
Operating Expenses $ 533.2us-gaap_OperatingExpenses $ 471.6us-gaap_OperatingExpenses
Increase to amortization of purchased intangibles 8.9us-gaap_AmortizationOfIntangibleAssets 10.9us-gaap_AmortizationOfIntangibleAssets
General and administrative    
Reclassification [Line Items]    
(Decrease) to general and administrative   (10.9)us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
Employee Benefits and Estimated Personal Property Liabilities    
Reclassification [Line Items]    
Operating Expenses $ 5.7us-gaap_OperatingExpenses
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= adsk_EmployeeBenefitsandEstimatedPersonalPropertyLiabilitiesMember