Restructuring (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended						15 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013		Oct. 31, 2012	Oct. 31, 2013 Minimum [Member]	Oct. 31, 2013 Fiscal 2013 Plan [Member]		Oct. 31, 2013 Fiscal 2013 Plan [Member]		Oct. 31, 2013 Fiscal 2013 Plan [Member] Employee Severance [Member]		Oct. 31, 2013 Fiscal 2013 Plan [Member] Facility Closing [Member]		Oct. 31, 2013 adsk_Fiscal2014Plan [Member]	Oct. 31, 2013 adsk_Fiscal2014Plan [Member] Employee Severance [Member]		Oct. 31, 2013 adsk_Fiscal2014Plan [Member] Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated (in number)							500								85
NumberOfFacilitiesThatWereConsolidated (in number)							8								4
Restructuring and Related Cost, Expected Cost						$ 15.0
Restructuring and Related Cost, Cost Incurred to Date	4.4		6.5						46.2
Restructuring Reserve [Roll Forward]
Beginning Balance			7.3				7.3				4.5		2.8			0		0
Additions	4.4	36.7	6.5		36.7						0.8		1.5			4.2		0
Payments			(10.2)								(5.0)		(4.2)			(1.0)		0
Adjustments			(0.1)	[1]							(0.2)	[1]	0.1	[1]		0	[1]	0	[1]
Ending Balance	3.5		3.5				3.5		3.5		0.1		0.2			3.2		0
Current portion At January 31, 2012							5.8	[2]
Current portion At October 31, 2012							3.4	[2]	3.4	[2]
Non-current portion At January 31, 2012							1.5	[2]
Non-current portion At October 31, 2012							$ 0.1	[2]	$ 0.1	[2]

[1] Adjustments include the impact of foreign currency translation.

[2] The current and non-current portions of the reserve are recorded in the Condensed Consolidated Balance Sheets under “Other accrued liabilities” and “Other liabilities,” respectively.