Income Tax	3 Months Ended
Income Tax	Apr. 30, 2021
Income Tax Disclosure [Abstract]
Income Tax	Income Tax Autodesk had income tax benefit of $24.2 million, relative to pre-tax income of $131.4 million for the three months ended April 30, 2021, and income tax expense of $24.0 million, relative to pre-tax income of $90.5 million for the three months ended April 30, 2020. Income tax benefit for the three months ended April 30, 2021, reflects a decrease in tax expense due to a discrete tax benefit primarily related to a Supreme Court decision in India on the taxability of software license payments to nonresidents and the associated withholding taxes, offset by an increase in tax expense from jurisdictional mix of year-to-date earnings relative to the worldwide annual effective tax rate. Autodesk regularly assesses the need for a valuation allowance against its deferred tax assets. In making that assessment, Autodesk considers both positive and negative evidence related to the likelihood of realization of the deferred tax assets to determine, based on the weight of available evidence, whether it is more likely than not that some or all of the deferred tax assets will not be realized. We have maintained a valuation allowance on our Netherlands, Canada, California, Michigan and capital loss deferred tax assets as it is more likely than not that some or all of the deferred tax assets will not be realized. As of April 30, 2021, the Company had $200.5 million of gross unrecognized tax benefits, of which $32.1 million would reduce our valuation allowance, if recognized. The remaining $168.4 million would impact the effective tax rate, if recognized. It is possible that the amount of unrecognized tax benefits will decrease in the next 12 months for an audit settlement of approximately $8.2 million.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.