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Other Intangible Assets and Related Accumulated Amortization (Details) (USD $) In Millions, unless otherwise specified | Apr. 30, 2015 | Jan. 31, 2015
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Finite-Lived Intangible Assets [Line Items] |  |  |  |
Other intangible assets, gross | $ 900.8 us-gaap_FiniteLivedIntangibleAssetsGross | [1] | $ 887.3 us-gaap_FiniteLivedIntangibleAssetsGross | [1]
Less: Accumulated amortization | (737.4)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | (715.4)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Other intangible assets, net | 163.4 us-gaap_FiniteLivedIntangibleAssetsNet |  | 171.9 us-gaap_FiniteLivedIntangibleAssetsNet |
Developed technologies, at cost |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Other intangible assets, gross | 550.2 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  | 538.4 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Customer relationships, trade names, patents, and user list, at cost |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Other intangible assets, gross | $ 350.6 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = adsk_CustomerRelationshipsTradeNamesPatentsandUserListMember | [2] | $ 348.9 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = adsk_CustomerRelationshipsTradeNamesPatentsandUserListMember | [2]
[1] | Includes the effects of foreign currency translation.
[2] | Included in “Other assets” in the accompanying Condensed Consolidated Balance Sheets.

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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