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Selected Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 648.3 | [1] | $ 599.8 | $ 609.5 | [2] | $ 646.5 | $ 664.6 | $ 618.0 | $ 637.1 | $ 592.5 |  | $ 2,504.1 | $ 2,512.2 | $ 2,273.9
Gross profit | 553.4 | [1] | 508.8 | 516.5 | [2] | 554.7 | 575.1 | 532.0 | 549.2 | 513.8 |  | 2,133.4 | 2,170.1 | 1,999.6
Income (loss) from operations | (9.7) | [1] | (14.8) | 4.3 | [2] | 21.5 | 14.0 | 14.6 | 49.9 | 42.2 |  | 1.3 | 120.7 | 284.8
Provision for income taxes | (16.7) | [1] | (21.3) | (269.5) | [2] | (2.7) | 18.6 | (0.9) | (11.6) | (7.3) |  | (310.2) | (1.2) | (51.1)
Net (loss) income | $ (37.2) | [1] | $ (43.8) | $ (268.6) | [2] | $ 19.1 | $ 11.5 | $ 10.7 | $ 31.3 | $ 28.3 |  | $ (330.5) | $ 81.8 | $ 228.8
Basic net income (loss) per share | $ (0.17) | [1] | $ (0.19) | $ (1.18) | [2] | $ 0.08 | $ 0.05 | $ 0.05 | $ 0.14 | $ 0.12 |  | $ (1.46) | $ 0.36 | $ 1.02
Diluted net income (loss) 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
Income from operations includes following items [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 56.1 | [1] | $ 50.2 | $ 40.7 | [2] | $ 50.2 | $ 49.1 | $ 43.1 | $ 39.8 | $ 33.6 |  | $ 197.2 | $ 165.6 | $ 132.2
Amortization of acquisition related intangibles | $ 19.9 | [1] | $ 19.7 | 20.2 | [2] | $ 22.4 | 21.9 | 22.6 | 24.6 | 23.9 |  | 82.2 | 93.0 |
Additions |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 0.8 | $ 2.3 |  | $ 0.0 | $ 3.1 | $ 12.8
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  | $ (33.1) |  |  |  |  |  |  | $ (33.1) |  |  |
Scenario, Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted net income (loss) per share | $ (0.15) |  |  |  |  |  |  |  |  |  |  | $ (1.44) |  |
Additional Foreign Withholding Taxes | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes | $ 4.5 |  |  |  |  |  |  |  |  |  |  |  |  |
[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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