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Stock-based Compensation Expense Intrinsic Value of Options Exercised and Weighted Average Grant Date Fair Value of Stock Options Granted (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |  |  |  |  |
Pre-tax intrinsic value of options exercised | $ 10.3 | [1] | $ 37.4 | [1] | $ 54.5 | [1] | $ 80.2 | [1]
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]
[1] | The intrinsic value of options exercised is calculated as the difference between the exercise price of the option and the market value of the stock on the date of exercise.
[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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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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