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Business and Summary of Significant Accounting Policies - Reclassifications (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jul. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) | $ 16.7 | [1] | $ 21.3 | $ 269.5 | [2] | $ 2.7 | $ (18.6) | $ 0.9 | $ 11.6 | $ 7.3 |  | $ 310.2 | $ 1.2 | $ 51.1
Diluted net (loss) income per share (usd per share) | $ (0.17) | [1] | $ (0.19) | $ (1.18) | [2] | $ 0.08 | $ 0.05 | $ 0.05 | $ 0.13 | $ 0.12 |  | $ (1.46) | $ 0.35 | $ 1.00
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  | $ 2,132.1 | $ 2,049.4 | $ 1,714.8
(Decrease) to general and administrative |  |  |  |  |  |  |  |  |  |  |  |  | (10.9) | (36.5)
Increase to amortization of purchased intangibles |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.9 | $ 36.5
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  | $ 33.1 |  |  |  |  |  |  | $ 33.1 |  |  |
Scenario, Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted net (loss) income per share (usd per share) | $ (0.15) |  |  |  |  |  |  |  |  |  |  | $ (1.44) |  |
Additional Foreign Withholding Taxes | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) | $ (4.5) |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits and Estimated Personal Property Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  | $ 5.7 |  |
[1] | Subsequent to furnishing preliminary financial statements on Form 8-K on February 25, 2016 for the three and twelve months ended January 31, 2016, Autodesk identified a $4.5 million tax adjustment associated with deemed foreign withholding taxes related to non-permanently reinvested earnings in foreign jurisdictions which have not yet repatriated resulting in changes to the Consolidated Financial Statements as reflected in this Annual Report on Form 10-K. This non-cash adjustment resulted in an increase to GAAP diluted loss per share from $(0.15) to $(0.17) for the three months ended January 31, 2016.
[2] | Certain second quarter fiscal 2016 balances have been revised to include the correction of an error identified in the third quarter of fiscal 2016, resulting in an additional $33.1 million of income tax expense from the previously reported results, primarily related to the establishment of a valuation allowance. See Note 1, "Business and Summary of Significant Accounting Policies" for further discussion.

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