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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) 2.7us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod [1]  
Exercised (in shares) (0.5)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Canceled/Forfeited (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod  
Options outstanding (in shares) 2.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Options vested and exercisable (in shares) 2.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Options vested (in shares) 2.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber [2]  
Options available (in shares) 12.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Weighted average exercise price per share    
Outstanding (in dollars per share) $ 34.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 34.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Granted (in dollars per share) $ 0.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice [1]  
Exercised (in dollars per share) $ 33.25us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice  
Canceled/Forfeited (in dollars per share) $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice  
Vested and exercisable (in dollars per share) $ 34.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Vested (in dollars per share) $ 34.73us-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 $ 49.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue [3]  
Options vested and exercisable, Aggregate Intrinsic Value 48.8us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 [3]  
Options vested, Aggregate Intrinsic Value $ 49.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue [2],[3]  
Sale of stock, price per share (in usd per share) $ 56.83us-gaap_SaleOfStockPricePerShare  
$12.31 - $29.49    
Number of Shares    
Options outstanding (in shares) 0.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range1Member		  
Options vested and exercisable (in shares) 0.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range1Member		  
Weighted average exercise price per share    
Outstanding (in dollars per share) $ 23.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range1Member		  
Vested and exercisable (in dollars per share) $ 23.83us-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) $ 12.31adsk_Sharebasedcompensationsharesauthorizedunderstockoptionplansexercisepricerangelowerlimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range1Member		  
Exercise Price, Upper Limit (in dollars per share) $ 29.49adsk_Sharebasedcompensationsharesauthorizedunderstockoptionplansexercisepricerangeupperlimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range1Member		  
$29.50 - $41.62    
Number of Shares    
Options outstanding (in shares) 0.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range2Member		  
Options vested and exercisable (in shares) 0.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range2Member		  
Weighted average exercise price per share    
Outstanding (in dollars per share) $ 39.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range2Member		  
Vested and exercisable (in dollars per share) $ 39.36us-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) $ 29.50adsk_Sharebasedcompensationsharesauthorizedunderstockoptionplansexercisepricerangelowerlimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range2Member		  
Exercise Price, Upper Limit (in dollars per share) $ 41.62adsk_Sharebasedcompensationsharesauthorizedunderstockoptionplansexercisepricerangeupperlimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range2Member		  
$42.39 - $43.81    
Number of Shares    
Options outstanding (in shares) 0.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range3Member		  
Options vested and exercisable (in shares) 0.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range3Member		  
Weighted average exercise price per share    
Outstanding (in dollars per share) $ 43.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range3Member		  
Vested and exercisable (in dollars per share) $ 43.79us-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) $ 42.39adsk_Sharebasedcompensationsharesauthorizedunderstockoptionplansexercisepricerangelowerlimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= adsk_Range3Member		  
Exercise Price, Upper Limit (in dollars per share) $ 43.81adsk_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.