Basis of Presentation Reclassification (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 30, 2012
Reclassification [Abstract]
Decrease to Cost of License and Other Revenue (for Reclass)	$ (6.3)
Increase to Subscription Revenue (for Reclass)	5.8
Decrease to License and Other Revenue (for Reclass)	(5.8)
Increase to Cost of Subscription Revenue (for Reclass)	$ 6.3

Decrease to Cost of License and Other Revenue (for Reclass)

No definition available.

Name:	adsk_DecreaseToCostOfLicenseAndOtherRevenueForReclass
Namespace Prefix:	adsk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration