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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 | $ 533.2 us-gaap_OperatingExpenses | $ 471.6 us-gaap_OperatingExpenses
Increase to amortization of purchased intangibles | 8.9 us-gaap_AmortizationOfIntangibleAssets | 10.9 us-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 | $ 5.7 us-gaap_OperatingExpenses / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = adsk_EmployeeBenefitsandEstimatedPersonalPropertyLiabilitiesMember |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. + References No definition available. + Details
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- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
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