Employee and Director Stock Plans - Schedule Of Share-based Compensation Options Activity (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2015
Number of Shares
Options outstanding (in shares)	5.9
Granted (in shares)	0	[1]
Exercised (in shares)	(3.2)
Canceled/Forfeited (in shares)	0
Options outstanding (in shares)	2.7
Options exercisable (in shares)	2.5
Options vested and exercisable and expected to vest (in shares)	2.7	[2]
Options available for grant (in shares)	14.3
Weighted average price per share
Options outstanding (per share)	$ 33.54
Granted (per share)	$ 0.00	[1]
Exercised (per share)	$ 32.76
Canceled/Forfeited (per share)	$ 0.00
Options outstanding (per share)	$ 34.46
Options exercisable (per share)	$ 33.72
Options vested and exercisable and expected to vest (per share)	$ 34.46	[2]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, Weighted average contractual term	4 years 2 months 12 days
Options outstanding, Aggregate Intrinsic Value	$ 53.1	[3]
Options vested and exercisable, Weighted average contractual term	3 years 10 months 24 days
Options vested and exercisable, Aggregate Intrinsic Value	49.9	[3]
Options vested and exercisable and expected to vest, Weighted average remaining contractual term	4 years 2 months 12 days	[2]
Options vested and exercisable and expected to vest, Aggregate Intrinsic Value	$ 53.1	[2],[3]

[1] Autodesk did not grant stock options in the twelve months ended January 31, 2015.

[2] Options expected to vest reflect an estimated forfeiture rate.

[3] Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $54.01 per share as of January 31, 2015, which would have been received by the option holders had all option holders exercised their options as of that date.