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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, 2012
Jan. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 78.8 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 14.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 2 years 9 months 18 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 31.12  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 20.6 28.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares) 0.1  
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) (2.5)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 32.17 $ 31.39
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 36.59  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 25.46  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 38.12  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (in years) 3 years 10 months 9 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in usd) 92.4 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares) 20.4 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 32.10 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 3 years 9 months 25 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value (in usd) $ 92.2 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 14.2  
Range 1 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 2.28  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 17.53  
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 $ 13.86  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 4.1  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 14.17  
Range 2 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 18.19  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 29.49  
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 $ 27.38  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 4.4  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 28.06  
Range3 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 29.50  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 38.55  
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 $ 32.72  
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 $ 32.70  
Range4 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 39.69  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 43.81  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 1.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 41.71  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 4.4  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 41.89  
Range 5 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 45.20  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 49.80  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 3.5  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 45.70  
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 $ 45.70  
[1] Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $31.85 per share as of October 31, 2012, which would have been received by the option holders had all option holders exercised their options as of that date.
[2] Options expected to vest reflect an estimated forfeiture rate.