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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
9 Months Ended
Oct. 31, 2013
Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 77.9 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 7.8  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (in years) 4 years 0 months 14 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 30.69  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 9.9 19.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares) 0 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) (5.4)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period (in shares) (3.7)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 32.36 $ 32.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in usd per share) $ 0.00 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in usd per share) $ 25.06  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price (in usd per share) $ 44.57  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (in years) 4 years 6 months 29 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in usd) 83.8 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares) 9.9 [3]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in usd per share) $ 32.33 [3]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term (in years) 4 years 6 months 25 days [3]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value (in usd) $ 83.7 [1],[3]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 11.5  
Range 1 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 2.28  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 23.74  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 2.0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 15.62  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 2.0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 15.62  
Range 2 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 24.97  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 29.50  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 2.0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 29.29  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 2.5  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 29.30  
Range3 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 29.56  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 38.55  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 1.3  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 33.87  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 1.5  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 34.18  
Range4 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 41.62  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 42.32  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 2.0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 41.62  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 3.1  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 41.62  
Range 5 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 42.39  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 48.72  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 0.5  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 45.12  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 0.8  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 44.58  
[1] Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $39.90 per share as of October 31, 2013, which would have been received by the option holders had all option holders exercised their options as of that date.
[2] Autodesk did not grant stock options in the nine months ended October 31, 2013.
[3] Options expected to vest reflect an estimated forfeiture rate.