Income Tax	3 Months Ended
Apr. 30, 2014
Income Tax Disclosure [Abstract]
Income Tax	Income Tax Autodesk’s effective tax rate was 21% during the three months ended April 30, 2014, compared to 23% during the three months ended April 30, 2013. Autodesk's effective tax rate decreased 2% during the three months ended April 30, 2014 as compared to the same period in the prior fiscal year primarily due to greater tax rate benefits from foreign earnings partially offset by tax rate detriments from stock-based compensation expense, accrual for uncertain tax positions and expiration of the federal research and development tax credit provision. Excluding the impact of discrete tax items, the effective tax rate for the three month period ended April 30, 2014 was 25% and was lower than the Federal statutory tax rate of 35% primarily due to foreign income taxed at lower rates partially offset by the impact of non-deductible stock based compensation expense and accrual for uncertain tax positions. As of April 30, 2014, the Company had $226.2 million of gross unrecognized tax benefits, excluding interest, of which approximately $218.6 million represents the amount of unrecognized tax benefits that would impact the effective tax rate, if recognized. It is possible that the amount of unrecognized tax benefits will change in the next twelve months; however, an estimate of the range of the possible change cannot be made at this time. At April 30, 2014, Autodesk had net deferred tax assets of $148.1 million. Pursuant to the adoption of ASU 2013-11, an additional $35.5 million of unrecognized tax benefits have been presented as a reduction of deferred tax assets at April 30, 2014. The Company believes that it will generate sufficient future taxable income in appropriate tax jurisdictions to realize these assets.

Income Tax

3 Months Ended

Apr. 30, 2014

Autodesk’s effective tax rate was 21% during the three months ended April 30, 2014, compared to 23% during the three months ended April 30, 2013. Autodesk's effective tax rate decreased 2% during the three months ended April 30, 2014 as compared to the same period in the prior fiscal year primarily due to greater tax rate benefits from foreign earnings partially offset by tax rate detriments from stock-based compensation expense, accrual for uncertain tax positions and expiration of the federal research and development tax credit provision. Excluding the impact of discrete tax items, the effective tax rate for the three month period ended April 30, 2014 was 25% and was lower than the Federal statutory tax rate of 35% primarily due to foreign income taxed at lower rates partially offset by the impact of non-deductible stock based compensation expense and accrual for uncertain tax positions.

As of April 30, 2014, the Company had $226.2 million of gross unrecognized tax benefits, excluding interest, of which approximately $218.6 million represents the amount of unrecognized tax benefits that would impact the effective tax rate, if recognized. It is possible that the amount of unrecognized tax benefits will change in the next twelve months; however, an estimate of the range of the possible change cannot be made at this time.

At April 30, 2014, Autodesk had net deferred tax assets of $148.1 million. Pursuant to the adoption of ASU 2013-11, an additional $35.5 million of unrecognized tax benefits have been presented as a reduction of deferred tax assets at April 30, 2014. The Company believes that it will generate sufficient future taxable income in appropriate tax jurisdictions to realize these assets.