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Income Taxes (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jan. 31, 2021
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Effective income tax rate | (554.90%) | 16.90% | (666.30%) | 9.00% |  |
Tax benefit related to remeasurement of deferred tax assets due to UK change in tax rate |  |  |  |  | $ 534,900,000 |
Deferred tax asset, intra-entity sale of certain intellectual property rights |  |  |  |  |  | $ 1,987,900,000

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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from intra-entity transfer of asset within consolidated group. Excludes intra-entity transfer of inventory. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 + Details
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