Income Taxes [Line Items]

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- Definition

Unrecognized Tax Benefits that Would Impact The Valuation Allowance

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No definition available.

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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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.

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- Definition

Amount of current and deferred foreign income tax expense (benefit) attributable to income (loss) from continuing operations.

+ References

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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.

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- Definition

The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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- Definition

Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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- Definition

Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
Income Taxes - Narrative (Details) - USD ($)	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