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Stock-based Compensation Expense Stock-Based Compensation Expense - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended | 3 Months Ended | 9 Months Ended
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Oct. 31, 2014 StockPlans | Oct. 31, 2013 | Oct. 31, 2014 StockPlans | Oct. 31, 2013 | Oct. 31, 2014 Restricted Stock Units (RSUs) and Performance Shares | Oct. 31, 2013 Restricted Stock Units (RSUs) and Performance Shares | Jan. 31, 2014 Restricted Stock Units (RSUs) and Performance Shares | Oct. 31, 2014 Restricted Stock Units (RSUs) | Oct. 31, 2013 Restricted Stock Units (RSUs) | Oct. 31, 2014 Restricted Stock Units (RSUs) | Oct. 31, 2013 Restricted Stock Units (RSUs) | Oct. 31, 2014 Performance Stock Unit | Oct. 31, 2013 Performance Stock Unit | Oct. 31, 2014 Performance Stock Unit | Oct. 31, 2013 Performance Stock Unit | Oct. 31, 2014 Performance Stock Unit Share-based compensation award, tranche one | Oct. 31, 2014 Performance Stock Unit Share-based compensation award, tranche two | Oct. 31, 2014 Performance Stock Unit Share-based compensation award, tranche three | Oct. 31, 2014 Employee Stock Plan 2012 | Jan. 14, 2014 Employee Stock Plan 2012 | Oct. 31, 2014 Employee Stock Plan 2012 | Oct. 31, 2014 Employee Stock Plan 2012 Maximum | Oct. 31, 2014 Directors stock plan 2012 | Oct. 31, 2014 Directors stock plan 2012 | Oct. 31, 2014 Directors stock plan 2012 Minimum | Oct. 31, 2014 Directors stock plan 2012 Maximum | Oct. 31, 2014 ESP Plan | Oct. 31, 2013 ESP Plan | Oct. 31, 2014 ESP Plan | Oct. 31, 2013 ESP Plan
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation arrangements by share based payment awards, number of active plans (plan) | 2 |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation arrangement by share based payment award expired or terminated plans (plan) | 7 |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awards, number of additional shares authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,400,000 |  |  |  |  |  |  |  |  |  |
Awards, number of shares authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,600,000 |  |  | 2,600,000 |  |  |  |  |  |
Stock issued during period, shares, restricted stock award, net of forfeitures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,600,000 |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, share-based compensation, forfeited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Share-based compensation shares granted to share issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.79 |  |  |  | 2.11 |  |  |  |  |  |  |
Options granted in period |  |  |  |  | 0 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,500,000 |  |  |  | 600,000 |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  | 1 year | 3 years |  |  |  |
Share based compensation arrangement by share based payment award options expiration term (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Employee stock plan shares remaining available for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,900,000 |  |  | 2,000,000 |  |  | 36,000,000 |  | 36,000,000 |
Sale of stock, price per share (in usd per share) | $ 57.54 |  |  |  | $ 57.54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonvested awards, total compensation cost not yet recognized | $ 1.6 |  |  |  | $ 1.6 |  |  |  |  |  |  | $ 236.2 |  | $ 236.2 |  | $ 7.0 |  | $ 7.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonvested options outstanding, weighted average remaining contractual term |  |  |  |  | 4 months 9 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awards granted in period, weighted average grant date fair value (in usd per share) |  |  |  |  |  |  |  |  | $ 52.89 | $ 40.64 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awards vested in period, fair value |  |  |  |  |  |  |  |  | 78.6 | 49.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awards granted in period |  |  |  |  |  |  |  |  | 3,572,000 |  |  |  |  | 3,100,000 |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PSU Annual Vesting Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.33% | 33.33% | 33.33% |  |  |  |  |  |  |  |  |  |  |  |
Allocated share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 31.2 | $ 18.8 | $ 82.1 | $ 52.4 | $ 4.9 | $ 2.1 | $ 12.7 | $ 6.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonvested awards, total compensation cost not yet recognized, period for recognition |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 10 months 17 days |  |  |  | 1 year 0 months 14 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awards, nonvested, number |  |  |  |  |  |  |  |  | 7,569,700 |  | 6,515,600 | 6,700,000 |  | 6,700,000 |  | 900,000 |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan maximum percentage of compensation to purchase shares by eligible participants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |
Employee stock purchase plan minimum percentage of common stock fair value defined to purchase shares by eligible participants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |
Options, other increases (decreases) in period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |
Options, other increases (decreases) in period percentage calculation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |
Shares issued under employee stock purchase plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 1,400,000 | 2,100,000 | 2,900,000
Awards issued, share average price (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34.19 | $ 22.95 | $ 33.91 | $ 22.61
Weighted average grant date fair value per share of stock options granted (in dollars per share) | $ 0.00 | [2] | $ 0.00 | [2] | $ 0.00 | [2] | $ 0.00 | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.44 | $ 11.80 | $ 15.14 | $ 11.80
[1] | Autodesk did not grant stock options in the nine months ended October 31, 2014.
[2] | The weighted average grant date fair value per share of stock options granted is calculated, as of the stock option grant date, using the Black-Scholes Merton ("BSM") option pricing model. For the three and nine months ended October 31, 2014 and 2013, Autodesk did not grant stock options.

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