Restructuring Charges, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
Jul. 31, 2020	Jul. 31, 2019	Apr. 30, 2020
Restructuring Cost And Reserve [Line Items]
Restructuring charges, net	$ 27,487
Restructuring liability included in other long-term liabilities	600		$ 600
Severance
Restructuring Cost And Reserve [Line Items]
Restructuring charges, net	$ 27,500	$ 0

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration