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Employee and Director Stock Plans - Stock-Based Compensation Expense - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 12 Months Ended
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Jun. 10, 2015 shares | Jan. 31, 2017 USD ($) period Plan $ / shares shares | Jan. 31, 2016 USD ($) $ / shares shares | Jan. 31, 2015 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 |  |  |
Shares available for future issuance (in shares) |  | 58,900,000 |  |
Share based compensation expense, restricted stock units | $ |  |  |  | $ 0.0
Shares available for future issuance, increases on the first trading day of each fiscal year (In shares) |  | 5,000,000 |  |
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 |  |
Shares available for future issuance (in shares) |  | 12,400,000 |  |
Vesting period |  | 3 years |  |
Directors stock plan 2012 |  |  |  |
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) |  | 900,000 |  |
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) |  | 45,600,000 |  |
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% |  |
Number of exercise periods | period |  | 4 |  |
Term of exercise period |  | 6 months |  |
Term of offering period |  | 24 months |  |
Shares issued under the ESP plan (in dollars per share) |  | 2,300,000 | 2,100,000 | 2,100,000
Shares issued under the ESP Plan, average price (in dollars per share) | $ / shares |  | $ 36.99 | $ 36.29 | $ 33.91
Weighted average grant date fair value (in dollars per share) | $ / shares |  | $ 19.20 | $ 11.85 | $ 15.14
Employee Service Share Based Compensation recognized Compensation Costs On Nonvested Restricted Shares | $ |  | $ 25.9 | $ 27.1 | $ 23.9
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) |  | 36,700,000 |  |
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 |  | $ 65.95 | $ 52.53 | $ 54.17
Fair value of units vested in period | $ |  | $ 232.2 | $ 193.3 | $ 147.8
Restricted stock granted (in shares) |  | 4,226,300 |  |
Number of awards granted but unreleased |  | 7,622,400 | 7,739,600 |
Restricted Stock Units (RSUs) |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |
Restricted stock granted (in shares) |  | 3,800,000 |  |
Share based compensation expense, restricted stock units | $ |  | $ 173.0 | $ 146.4 | 118.9
Total compensation cost related to non-vested awards not yet recognized | $ |  | $ 309.8 |  |
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 |  | 6,800,000 |  |
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 |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |
Grants in period, net of forfeitures (in shares) |  | 800,000 |  |
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 | $ |  | $ 22.9 | $ 23.2 | $ 17.5
Total compensation cost related to non-vested awards not yet recognized | $ |  | $ 3.2 |  |
Total compensation cost related to non-vested awards not yet recognized, weighted average period of recognition (in years) |  | 9 months 18 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% |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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