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Property, Plant, and Equipment - Summary of Depreciation and Amortization Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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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- Definition 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 + Details
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