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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, 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 $ 119.3 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 14.3  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (in years) 3 years 0 months 25 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 32.96  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 16.7 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) (2.0)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period (in shares) (0.3)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 33.66 $ 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) $ 23.46  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price (in usd per share) $ 40.21  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (in years) 3 years 7 months 20 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in usd) 126.5 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares) 16.6 [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) $ 33.64 [3]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term (in years) 3 years 7 months 6 days [3]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value (in usd) $ 126.3 [1],[3]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 12.7  
Range 1 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 2.28  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 28.56  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 3.3  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 15.99  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 3.5  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 16.62  
Range 2 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 28.57  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 31.22  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 2.9  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 29.53  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 3.4  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 29.54  
Range3 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 31.23  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 38.55  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 2.3  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 33.79  
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) $ 34.03  
Range4 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 38.56  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 41.62  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 2.2  
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) 3.3  
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 $ 41.63  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 49.80  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 3.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 45.52  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 4.0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 45.38  
[1] Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $39.38 per share as of April 30, 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 three months ended April 30, 2013.
[3] Options expected to vest reflect an estimated forfeiture rate.