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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
Income Taxes [Line Items] |  |  |  |
Foreign pretax income (loss) | $ 527,800,000 | $ 475,500,000 | $ 181,400,000 |
Deferred tax assets, valuation allowance | 186,500,000 | 883,400,000 |  |
Valuation allowance increase (decrease) | (696,900,000) | 85,600,000 | 163,600,000 |
Gross unrecognized tax benefits | 198,000,000.0 | 220,600,000 | 209,000,000.0 | $ 337,600,000
Unrecognized tax benefits that would reduce the valuation allowance if recognized | 31,700,000 |  |  |
Effect of change in unrecognized tax benefits | 8,200,000 |  |  |
Unrecognized tax benefits | 4,500,000 | 2,300,000 | 3,100,000 |
Income tax expense from penalties and interest | 2,200,000 | 800,000 | 300,000 |
Foreign income tax expense (benefit) | $ 0.0 | $ 0.0 | $ (11,400,000) |
Income tax benefits per share (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.05 |
Valuation Allowance, Tax Credit Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Amount of gross unrecognized tax benefits that would impact the effective tax rate, if recognized | $ 166,300,000 |  |  |
Domestic Country |  |  |  |
Income Taxes [Line Items] |  |  |  |
Valuation allowance increase (decrease) | (679,000,000.0) |  |  |
Operating loss carryforwards | 8,800,000 |  |  |
Domestic Country | Research Tax Credit Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward | 166,800,000 |  |  |
Foreign Country |  |  |  |
Income Taxes [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | 65,000,000 |  |  |
Operating loss carryforwards | 222,000,000.0 |  |  |
Tax credit carryforward | 112,200,000 |  |  |
Foreign Country | Norway |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards | 22,500,000 |  |  |
Foreign Country | Singapore |  |  |  |
Income Taxes [Line Items] |  |  |  |
Valuation allowance increase (decrease) |  | $ 42,000,000.0 |  |
Operating loss carryforwards | 156,400,000 |  |  |
Foreign Country | NETHERLANDS |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards | 40,000,000.0 |  |  |
Foreign Country | Canada | Research Tax Credit Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward | 56,800,000 |  |  |
Foreign Country | ONTARIO | Research Tax Credit Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward | 1,600,000 |  |  |
State and Local Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards | 560,400,000 |  |  |
State and Local Jurisdiction | California | Research Tax Credit Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward | $ 97,300,000 |  |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.3) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 + Details
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