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Property, Plant, and Equipment - Summary of Depreciation and Amortization Expense (Detail) - USD ($) $ in Thousands		12 Months Ended
		Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization		$ 31,575	$ 31,972	$ 29,046
Cost of sales
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization		21,026	21,142	20,760
Research and development
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization		519	584	545
Selling and marketing
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization		533	446	530
General and administrative
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization	[1]	8,606	9,113	6,780
Interest expense
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization		$ 891	$ 687	$ 431
[1] General and administrative expenses included $330,644, $344,527, and $286,261 of amortization for the fiscal years ended April 30, 2021, 2020, and 2019, respectively, which were recorded as a result of our acquisitions.

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Depreciation and other amortization expenses.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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