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v3.19.2

Restructuring Charges, Net - Additional Information (Detail) - USD ($) | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges, net | $ 0 | $ 78,000 | $ 34,600,000
Facilities |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges, net |  | $ 100,000 | 18,600,000
Severance |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges, net |  |  | $ 16,000,000

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- Definition Restructuring charges (recoveries) net. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |