Financial Instruments - Fair Value of Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2014		Jan. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative asset, net	$ 21.3		$ 17.4
Derivative liability, net	1.7		3.9
Designated as Hedging Instrument | Foreign Exchange Contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, net	4.4	[1]	6.7	[1]
Derivative asset, gross	5.9		8.2
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, net	1.7	[2]	3.9	[2]
Derivative liability, gross	3.2		5.4
Not Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative asset, net	$ 16.9		$ 10.7

[1] Considering Autodesk's master netting arrangements, these contracts are presented net settled. The gross balance is $5.9 million and $8.2 million at January 31, 2014 and January 31, 2013, respectively.

[2] Considering Autodesk's master netting arrangements, these contracts are presented net settled. The gross balance is $3.2 million and $5.4 million at January 31, 2014 and January 31, 2013, respectively.