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Property, Plant, and Equipment - Summary of Depreciation and Amortization Expense (Detail) - USD ($) $ in Thousands		12 Months Ended
		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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Depreciation and other amortization expenses.

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No definition available.

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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://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

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