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Acquisitions - Additional Information (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended |
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Jun. 27, 2014 | May 29, 2014 | Feb. 06, 2014 | Nov. 21, 2013 | Jan. 31, 2015 Entity | Jan. 31, 2014 Entity | Jan. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 1,456.2 us-gaap_Goodwill | $ 1,009.9 us-gaap_Goodwill | $ 871.5 us-gaap_Goodwill
Shotgun Software Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration transferred | 54.5 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = adsk_ShotgunMember |  |  |  |  |  |
Payments to acquire business | 51.2 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = adsk_ShotgunMember |  |  |  |  |  |
Fair value of original convertible debt investment | 3.3 adsk_FairValueofOriginalConvertibleDebtInvestment / us-gaap_BusinessAcquisitionAxis = adsk_ShotgunMember |  |  |  |  |  |
Goodwill |  |  |  |  | 43.2 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = adsk_ShotgunMember |  |
Within Technologies Limited |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire business |  | 88.0 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = adsk_WithinTechnologiesLimitedMember |  |  |  |  |
Goodwill |  | 78.9 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = adsk_WithinTechnologiesLimitedMember |  |  | 80.6 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = adsk_WithinTechnologiesLimitedMember |  |
Delcam plc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration transferred |  |  | 284.6 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = adsk_DelcamMember |  |  |  |
Goodwill |  |  | 166.0 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = adsk_DelcamMember |  | 190.4 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = adsk_DelcamMember |  |
Graitec SA |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire business |  |  |  | 87.0 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = adsk_VelaSystemsMember |  |  |
Goodwill |  |  |  | 64.1 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = adsk_VelaSystemsMember |  | 73.4 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = adsk_VelaSystemsMember |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire business |  |  |  |  | 234.5 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 89.7 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Goodwill |  |  |  |  | $ 180.6 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | $ 67.0 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Number of Businesses Acquired |  |  |  |  | 21 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 14 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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