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Financial Instruments - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions | Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013
--- | --- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |  |
Notional amount of foreign currency forward contracts not designated as cash flow hedges |  | $ 142.4 | $ 336.6 |  |
Net loss expected to be recognized into earnings |  | 1,619.6 | 2,219.2 | $ 2,261.5 | $ 2,043.2
Derivative asset, net |  | 8.3 | 21.3 |  |
Derivative liability, net |  | 6.4 | 5.4 |  |
Net Unrealized Gains (Losses) on Derivative Instruments |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Net loss expected to be recognized into earnings |  | 15.7 | 42.8 | $ 3.5 |
Foreign Exchange Contracts |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Notional amount of foreign currency forward contracts not designated as cash flow hedges |  | 231.6 | 44.6 |  |
Designated as Hedging Instrument | Foreign Exchange Contracts | Prepaid expenses and other current assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative asset, net | [1] | 3.4 | 20.4 |  |
Derivative asset, gross |  | 5.1 | 23.8 |  |
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Accrued Liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liability, net | [2] | 3.4 | 5.4 |  |
Derivative liability, gross |  | 5.1 | 8.7 |  |
Not Designated as Hedging Instrument | Other assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative asset, net |  | 4.9 | 0.9 |  |
Not Designated as Hedging Instrument | Other Accrued Liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liability, net | [2] | $ 3.0 | $ 0.0 |  |
[1] | Considering Autodesk's master netting arrangements, these contracts are presented net settled. The gross balance is $5.1 million and $23.8 million at January 31, 2016 and January 31, 2015, respectively.
[2] | Considering Autodesk's master netting arrangements, these contracts are presented net settled. The gross balance is $5.1 million and $8.7 million at January 31, 2016 and January 31, 2015, respectively.

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 + Details
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