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Restructuring Charges - Additional Information (Detail) | Apr. 30, 2021 | Oct. 30, 2020 | Jul. 31, 2020
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August 2020 Restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction of global work force |  | 5.00% |
May 2020 Restructuring | Maximum |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction of global work force |  |  | 1.00%
May 2019 Restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction of global work force | 2.00% |  |
April 2019 Restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction of global work force | 1.00% |  |
May 2018 Restructuring | Maximum |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction of global work force | 2.00% |  |
November 2016 Restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reduction of global work force | 6.00% |  |

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- Definition Percentage of the total number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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