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Income Taxes (Tables) | 12 Months Ended
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Jan. 31, 2018
Income Tax Disclosure [Abstract] |
Provision for income taxes | The provision for income taxes consists of the following:
| Fiscal year ended January 31,
2018 |  | 2017 |  | 2016
Federal: |  |  |  |  |
Current | $ | (0.8 | ) |  | $ | 1.6 |  |  | $ | (4.7 | )
Deferred | (19.3 | ) |  | 8.4 |  |  | 220.9 |
State: |  |  |  |  |
Current | (0.3 | ) |  | (1.9 | ) |  | 0.5 |
Deferred | 2.2 |  |  | 1.3 |  |  | 20.9 |
Foreign: |  |  |  |  |
Current | 50.9 |  |  | 93.9 |  |  | 68.4 |
Deferred | (23.1 | ) |  | (45.0 | ) |  | 4.2 |
| $ | 9.6 |  |  | $ | 58.3 |  |  | $ | 310.2 |
Differences between the U.S. statutory rate and the aggregate income tax provision | The differences between the U.S. statutory rate and the aggregate income tax provision are as follows:
| Fiscal year ended January 31,
2018 |  | 2017 |  | 2016
Income tax provision (benefit) at U.S. Federal statutory rate | $ | (188.4 | ) |  | $ | (177.0 | ) |  | $ | (7.1 | )
State income tax benefit, net of the U.S. Federal benefit | (21.9 | ) |  | (17.3 | ) |  | (7.6 | )
Foreign income taxed at rates different from the U.S. statutory rate | (53.3 | ) |  | 22.3 |  |  | (29.4 | )
U.S. valuation allowance | (82.5 | ) |  | 233.0 |  |  | 345.0 |
Transition tax | 408.4 |  |  | — |  |  | — |
Increase in attributes due to ASU 2016-9 adoption |  |  |  | (119.4 | ) |  | — |
Change in valuation allowance from ASU 2016-9 adoption | — |  |  | 119.4 |  |  | — |
Tax effect of non-deductible stock-based compensation | 20.7 |  |  | 18.8 |  |  | 19.3 |
Stock compensation windfall / shortfall | (67.7 | ) |  | (23.0 | ) |  | — |
Research and development tax credit benefit | (11.3 | ) |  | (10.3 | ) |  | (9.4 | )
Closure of income tax audits and changes in uncertain tax positions | 1.2 |  |  | 8.2 |  |  | (4.7 | )
Tax effect of officer compensation in excess of $1.0 million | 2.2 |  |  | 2.2 |  |  | 1.4 |
Non-deductible expenses | 2.1 |  |  | 2.0 |  |  | 2.6 |
Other | 0.1 |  |  | (0.6 | ) |  | 0.1 |
| $ | 9.6 |  |  | $ | 58.3 |  |  | $ | 310.2 |
Components of Deferred Tax Assets and Liabilities | Significant components of Autodesk’s deferred tax assets and liabilities are as follows:
| January 31,
2018 |  | 2017
Stock-based compensation | $ | 26.7 |  |  | $ | 37.6 |
Research and development tax credit carryforwards | 170.3 |  |  | 136.7 |
Foreign tax credit carryforwards | 162.2 |  |  | 127.3 |
Accrued compensation and benefits | 25.9 |  |  | 39.5 |
Other accruals not currently deductible for tax | 22.9 |  |  | 18.7 |
Purchased technology and capitalized software | 43.4 |  |  | 76.9 |
Fixed assets | 16.5 |  |  | 24.3 |
Tax loss carryforwards | 85.7 |  |  | 173.6 |
Deferred revenue | 120.3 |  |  | 128.3 |
Other | 32.4 |  |  | 27.6 |
Total deferred tax assets | 706.3 |  |  | 790.5 |
Less: valuation allowance | (634.2 | ) |  | (748.0 | )
Net deferred tax assets | 72.1 |  |  | 42.5 |
Indefinite lived intangibles | (57.0 | ) |  | (70.1 | )
Total deferred tax liabilities | (57.0 | ) |  | (70.1 | )
Net deferred tax assets | $ | 15.1 |  |  | $ | (27.6 | )
Unrecognized Tax Benefits Reconciliation, Table | A reconciliation of the beginning and ending amount of the gross unrecognized tax benefits is as follows:
| Fiscal Year Ended January 31,
| 2018 |  | 2017 |  | 2016
Gross unrecognized tax benefits at the beginning of the fiscal year | $ | 261.4 |  |  | $ | 254.3 |  |  | $ | 245.8 |
Increases for tax positions of prior years | 22.8 |  |  | 11.9 |  |  | 1.4 |
Decreases for tax positions of prior years | (22.5 | ) |  | (4.1 | ) |  | (7.0 | )
Increases for tax positions related to the current year | 78.4 |  |  | 11.1 |  |  | 15.8 |
Decreases relating to settlements with taxing authorities | (0.8 | ) |  | (10.8 | ) |  | (0.5 | )
Reductions as a result of lapse of the statute of limitations | (1.7 | ) |  | (1.0 | ) |  | (1.2 | )
Gross unrecognized tax benefits at the end of the fiscal year | $ | 337.6 |  |  | $ | 261.4 |  |  | $ | 254.3 |

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