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Deferred Compensation	6 Months Ended
Deferred Compensation	Jul. 31, 2017
Deferred Compensation Arrangements [Abstract]
Deferred Compensation	Deferred Compensation At July 31, 2017, Autodesk had marketable securities totaling $769.6 million, of which $54.4 million related to investments in debt and equity securities that are held in a rabbi trust under non-qualified deferred compensation plans. The total related deferred compensation liability was $54.4 million at July 31, 2017, of which $3.0 million was classified as current and $51.4 million was classified as non-current liabilities. The total related deferred compensation liability at January 31, 2017 was $47.3 million, of which $3.1 million was classified as current and $44.2 million was classified as non-current liabilities. The securities are recorded in the Condensed Consolidated Balance Sheets under the current portion of "Marketable securities." The current and non-current portions of the liability are recorded in the Condensed Consolidated Balance Sheets under “Accrued compensation” and “Other liabilities,” respectively.