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Employee and Director Stock Plans - Stock-Based Compensation Expense - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 14, 2014 shares | Jan. 31, 2016 USD ($) Plan $ / shares shares | Jan. 31, 2015 USD ($) $ / shares shares | Jan. 31, 2014 USD ($) $ / shares shares
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Number of Active Stock Plans | Plan |  |  | 2 |  |
Number of Expired Plans | Plan |  |  | 2 |  |
Number of additional share authorized (in shares) |  | 12,500,000 |  |  |
Grants in period, net of forfeitures (in shares) | [1] |  | 0 |  |
Shares available for future issuance (in shares) |  |  | 62,900,000 |  |
Share based compensation expense, restricted stock units | $ |  |  |  |  | $ 0.0
Percentage of compensation that eligible employees can use to purchase common stock, maximum |  |  | 15.00% |  |
Percentage of fair market value eligible employees can purchase common stock, minimum |  |  | 85.00% |  |
Shares available for future issuance, increases on the first trading day of each fiscal year (In shares) |  |  | 10,000,000 |  |
Shares available for future issuance, percentage of outstanding shares plus any shares repurchased by Autodesk (as a percent) |  |  | 2.00% |  |
Employee Stock Plan 2012 |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Shares of common stock reserved for issuance (in shares) |  |  | 45,100,000 |  |
Restricted stock award, net of forfeitures (in shares) |  |  | 39,100,000 |  |
Shares forfeited (in shares) |  |  | 6,000,000 |  |
Shares granted to shares issued (in shares) |  |  | 1.79 |  |
Vesting period |  |  | 3 years |  |
Shares available for future issuance (in shares) |  |  | 18,600,000 |  |
Directors stock plan 2012 [Member] |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Number of additional share authorized (in shares) |  |  | (900,000) |  |
Shares of common stock reserved for issuance (in shares) |  |  | 1,700,000 |  |
Shares granted to shares issued (in shares) |  |  | 2.11 |  |
Shares available for future issuance (in shares) |  |  | 1,000,000 |  |
Outside directors stock plan 2012 | Minimum |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Vesting period |  |  | 1 year |  |
Outside directors stock plan 2012 | Maximum |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
ESP Plan |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Shares available for future issuance (in shares) |  |  | 43,300,000 |  |
Shares issued under the ESP plan (in dollars per share) |  |  | 2,100,000 | 2,100,000 | 2,900,000
Shares issued under the ESP Plan, average price (in dollars per share) | $ / shares |  |  | $ 36.29 | $ 33.91 | $ 22.61
Weighted average grant date fair value (in dollars per share) | $ / shares |  |  | $ 11.85 | $ 15.14 | $ 11.80
Employee Service Share Based Compensation recognized Compensation Costs On Nonvested Restricted Shares | $ |  |  | $ 27.1 | $ 23.9 | $ 22.9
Stock Options and Restricted Stock | Employee Stock Plan 2012 |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Grants in period, net of forfeitures (in shares) |  |  | 29,200,000 |  |
Share based payment award options expiration term (in years) |  |  | 10 years |  |
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 52.53 | $ 54.17 | $ 42.37
Fair value of units vested in period | $ |  |  | $ 193.3 | $ 147.8 | $ 87.0
Restricted stock granted (in shares) |  |  | 4,035,100 |  |
Number of awards granted but unreleased |  |  | 7,739,600 | 7,801,300 |
Restricted Stock Units (RSUs) |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Restricted stock granted (in shares) |  |  | 3,600,000 |  |
Share based compensation expense, restricted stock units | $ |  |  | $ 146.4 | $ 118.9 | 74.9
Total compensation cost related to non-vested awards not yet recognized | $ |  |  | $ 248.2 |  |
Total compensation cost related to non-vested awards not yet recognized, weighted average period of recognition (in years) |  |  | 1 year 9 months 18 days |  |
Number of awards granted but unreleased |  |  | 6,900,000 |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Restricted Stock Units (RSUs) | Directors stock plan 2012 [Member] |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Grants in period, net of forfeitures (in shares) |  |  | 700,000 |  |
Performance Stock Units (PSUs) |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Restricted stock granted (in shares) |  |  | 400,000 |  |
Share based compensation expense, restricted stock units | $ |  |  | $ 23.2 | $ 17.5 | $ 8.7
Total compensation cost related to non-vested awards not yet recognized | $ |  |  | $ 3.6 |  |
Total compensation cost related to non-vested awards not yet recognized, weighted average period of recognition (in years) |  |  | 9 months 25 days |  |
Number of awards granted but unreleased |  |  | 800,000 |  |
Performance Stock Units (PSUs) | Year One |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Vesting percentage (up to percentage) |  |  | 33.33% |  |
Performance Stock Units (PSUs) | Year Two |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Vesting percentage (up to percentage) |  |  | 33.33% |  |
Performance Stock Units (PSUs) | Year Three |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Vesting percentage (up to percentage) |  |  | 33.33% |  |
[1] | Autodesk did not grant stock options in the twelve months ended January 31, 2016.

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