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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
6 Months Ended
Jul. 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) 10.7  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (in years) 3 years 7 months 6 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 30.14  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 12.9 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) (2.7)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period (in shares) (3.4)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 31.53 $ 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) $ 23.05  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price (in usd per share) $ 44.53  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (in years) 4 years 2 months 12 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in usd) 81.4 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares) 12.9 [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) $ 31.50 [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 2 months 12 days [3]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value (in usd) $ 81.3 [1],[3]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 15.1  
Range 1 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 2.28  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 19.55  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 2.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 14.94  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 2.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 14.94  
Range 2 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 20.12  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 29.49  
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) $ 28.63  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 2.7  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 28.67  
Range3 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 29.50  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 34.53  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 2.4  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 31.78  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 2.7  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 31.64  
Range4 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 34.70  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 38.55  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 0.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 37.04  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 0.7  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 36.95  
Range 5 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 41.62  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 49.80  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 2.8  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in usd per share) $ 42.78  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 4.2  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in usd per share) $ 42.54  
[1] Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $35.39 per share as of July 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 six months ended July 31, 2013.
[3] Options expected to vest reflect an estimated forfeiture rate.