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Stock-based Compensation Expense Schedule Of Share-based Compensation Options Activity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Apr. 30, 2015 | Jan. 31, 2015
Number of Shares |  |  |
Options outstanding (in shares) | 2.7 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |
Granted (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | [1] |
Exercised (in shares) | (0.5)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |
Canceled/Forfeited (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod |  |
Options outstanding (in shares) | 2.2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |
Options vested and exercisable (in shares) | 2.2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |  |
Options vested (in shares) | 2.2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber | [2] |
Options available (in shares) | 12.0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |
Weighted average exercise price per share |  |  |
Outstanding (in dollars per share) | $ 34.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  | $ 34.46 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Granted (in dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice | [1] |
Exercised (in dollars per share) | $ 33.25 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice |  |
Canceled/Forfeited (in dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice |  |
Vested and exercisable (in dollars per share) | $ 34.77 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice |  |
Vested (in dollars per share) | $ 34.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice | [2] |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Options outstanding, Weighted average remaining contractual term | 4 years 1 month 6 days |  |
Options vested and exercisable, Weighted average remaining contractual term | 4 years 1 month 6 days |  |
Options vested, Weighted average remaining contractual term | 4 years 1 month 6 days | [2] |
Options outstanding, Aggregate Intrinsic Value | $ 49.3 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue | [3] |
Options vested and exercisable, Aggregate Intrinsic Value | 48.8 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 | [3] |
Options vested, Aggregate Intrinsic Value | $ 49.3 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue | [2],[3] |
Sale of stock, price per share (in usd per share) | $ 56.83 us-gaap_SaleOfStockPricePerShare |  |
$12.31 - $29.49 |  |  |
Number of Shares |  |  |
Options outstanding (in shares) | 0.8 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range1Member |  |
Options vested and exercisable (in shares) | 0.8 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range1Member |  |
Weighted average exercise price per share |  |  |
Outstanding (in dollars per share) | $ 23.91 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range1Member |  |
Vested and exercisable (in dollars per share) | $ 23.83 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range1Member |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Exercise Price, Lower Limit (in dollars per share) | $ 12.31 adsk_Sharebasedcompensationsharesauthorizedunderstockoptionplansexercisepricerangelowerlimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range1Member |  |
Exercise Price, Upper Limit (in dollars per share) | $ 29.49 adsk_Sharebasedcompensationsharesauthorizedunderstockoptionplansexercisepricerangeupperlimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range1Member |  |
$29.50 - $41.62 |  |  |
Number of Shares |  |  |
Options outstanding (in shares) | 0.9 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range2Member |  |
Options vested and exercisable (in shares) | 0.9 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range2Member |  |
Weighted average exercise price per share |  |  |
Outstanding (in dollars per share) | $ 39.35 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range2Member |  |
Vested and exercisable (in dollars per share) | $ 39.36 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range2Member |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Exercise Price, Lower Limit (in dollars per share) | $ 29.50 adsk_Sharebasedcompensationsharesauthorizedunderstockoptionplansexercisepricerangelowerlimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range2Member |  |
Exercise Price, Upper Limit (in dollars per share) | $ 41.62 adsk_Sharebasedcompensationsharesauthorizedunderstockoptionplansexercisepricerangeupperlimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range2Member |  |
$42.39 - $43.81 |  |  |
Number of Shares |  |  |
Options outstanding (in shares) | 0.5 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range3Member |  |
Options vested and exercisable (in shares) | 0.5 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range3Member |  |
Weighted average exercise price per share |  |  |
Outstanding (in dollars per share) | $ 43.79 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range3Member |  |
Vested and exercisable (in dollars per share) | $ 43.79 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range3Member |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Exercise Price, Lower Limit (in dollars per share) | $ 42.39 adsk_Sharebasedcompensationsharesauthorizedunderstockoptionplansexercisepricerangelowerlimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range3Member |  |
Exercise Price, Upper Limit (in dollars per share) | $ 43.81 adsk_Sharebasedcompensationsharesauthorizedunderstockoptionplansexercisepricerangeupperlimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = adsk_Range3Member |  |
[1] | Autodesk did not grant stock options in the three months ended April 30, 2015.
[2] | Options expected to vest reflect an estimated forfeiture rate.
[3] | Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $56.83 per share as of April 30, 2015, which would have been received by the option holders had all option holders exercised their options as of that date.

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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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