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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jul. 31, 2018	Apr. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	$ 172,398	$ 172,213
Total definite-lived intangible assets, Accumulated Amortization	(65,170)	(59,679)
Total definite-lived intangible assets, Net Carrying Amount	107,228	112,534
Indefinite-lived intangible assets, Net Carrying Amount	226	226
Total Intangible assets, Gross Carrying Amount	172,624	172,439
Total Intangible assets, Net Carrying Amount	107,454	112,760
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	92,360	92,360
Total definite-lived intangible assets, Accumulated Amortization	(30,719)	(28,252)
Total definite-lived intangible assets, Net Carrying Amount	61,641	64,108
Developed technology
Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	21,130	21,130
Total definite-lived intangible assets, Accumulated Amortization	(9,461)	(8,178)
Total definite-lived intangible assets, Net Carrying Amount	11,669	12,952
Patents, trademarks, and trade names
Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	56,879	56,718
Total definite-lived intangible assets, Accumulated Amortization	(23,840)	(22,099)
Total definite-lived intangible assets, Net Carrying Amount	33,039	34,619
Backlog
Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	1,150	1,150
Total definite-lived intangible assets, Accumulated Amortization	(1,150)	(1,150)
Definite-lived intangible assets excluding patents in progress
Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	171,519	171,358
Total definite-lived intangible assets, Accumulated Amortization	(65,170)	(59,679)
Total definite-lived intangible assets, Net Carrying Amount	106,349	111,679
Patents in progress
Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	879	855
Total definite-lived intangible assets, Net Carrying Amount	$ 879	$ 855

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