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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, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Depreciation and Other Amortization Expenses [Line Items] |  |  |  |
Depreciation and amortization |  | $ 52,075 | $ 50,213 | $ 41,237
Cost of sales |  |  |  |
Depreciation and Other Amortization Expenses [Line Items] |  |  |  |
Depreciation and amortization |  | 24,582 | 24,744 | 22,332
Research and development |  |  |  |
Depreciation and Other Amortization Expenses [Line Items] |  |  |  |
Depreciation and amortization |  | 557 | 428 | 1,136
Selling and marketing |  |  |  |
Depreciation and Other Amortization Expenses [Line Items] |  |  |  |
Depreciation and amortization |  | 619 | 424 | 221
General and administrative |  |  |  |
Depreciation and Other Amortization Expenses [Line Items] |  |  |  |
Depreciation and amortization | [1] | 25,212 | 23,699 | 14,869
Interest expense |  |  |  |
Depreciation and Other Amortization Expenses [Line Items] |  |  |  |
Depreciation and amortization |  | $ 1,105 | $ 918 | $ 2,679
[1] | General and administrative expenses included $20.8 million, $18.4 million, and $9.9 million of amortization for the fiscal years ended April 30, 2018, 2017, and 2016, respectively, 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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