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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, 2012
Year
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, Number (in shares) 15.7  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term (in years) 3.1  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 30.81  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value (in usd) $ 161.9 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 22.4 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) (4.5)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period (in shares) (1.6)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 31.92 $ 31.39
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 36.66  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 26.65  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 37.77  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (in years) 4.3  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in usd) 202.1 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares) 22.0 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 31.82 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term (in years) 4.3  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value (in usd) $ 200.6 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 13.9  
Range 1 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 2.28  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 17.37  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 4.0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 13.46  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 4.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 13.79  
Range 2 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerLimit $ 17.53  
ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperLimit $ 29.49  
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 $ 26.97  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 4.8  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 27.80  
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) 3.5  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 32.79  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 4.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 32.90  
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) 1.7  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 41.69  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 4.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 41.88  
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) 3.7  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 45.76  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares) 3.8  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 45.76  
[1] Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $39.37 per share as of April 30, 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.