Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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.

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No definition available.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 16,300,000	$ 18,900,000	$ 21,600,000
Weighted-average period for amortization of intangible assets	5 years
Impairment charges for long-lived intangible assets	$ 0	$ 0	$ 0
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-average period for amortization of intangible assets	5 years
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Weighted-average period for amortization of intangible assets	6 years
Patents, Trademarks, and Trade Names
Finite-Lived Intangible Assets [Line Items]
Weighted-average period for amortization of intangible assets	5 years