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Business and Summary of Significant Accounting Policies - Other Intangible Assets and Related Accumulated Amortization (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Amortization of intangible assets | $ 39.8 us-gaap_AmortizationOfIntangibleAssets |  | $ 36.5 us-gaap_AmortizationOfIntangibleAssets |  | $ 42.1 us-gaap_AmortizationOfIntangibleAssets
Developed technologies, at cost | 538.4 adsk_PurchasedTechnologiesAtCost |  | 462.4 adsk_PurchasedTechnologiesAtCost |  |
Customer relationships, trade names, patents, and user lists, at cost | 348.9 us-gaap_OtherFiniteLivedIntangibleAssetsGross | [1] | 268.1 us-gaap_OtherFiniteLivedIntangibleAssetsGross | [1] |
Other intangible assets, gross | 887.3 us-gaap_FiniteLivedIntangibleAssetsGross |  | 730.5 us-gaap_FiniteLivedIntangibleAssetsGross |  |
Less: Accumulated amortization | (715.4)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | (626.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  |
Other intangible assets, net | 171.9 us-gaap_FiniteLivedIntangibleAssetsNet |  | 104.3 us-gaap_FiniteLivedIntangibleAssetsNet |  |
Weighted average useful life | 4 years 2 months 5 days |  |  |  |
Customer Relationships, Trade Names, Patents, and User List |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Amortization of intangible assets | $ 92.9 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = adsk_CustomerRelationshipsTradeNamesPatentsandUserListMember |  | $ 80.7 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = adsk_CustomerRelationshipsTradeNamesPatentsandUserListMember |  | $ 82.0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = adsk_CustomerRelationshipsTradeNamesPatentsandUserListMember
Customer Relationships, Trade Names, Patents, and User List | Minimum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 1 year |  |  |  |
Customer Relationships, Trade Names, Patents, and User List | Maximum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |  |  |
[1] | Included as a net balance in “Other assets” in the Consolidated Balance Sheet. Customer relationships and trade names include the effects of foreign currency translation.

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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