Intangible Assets (Tables)

12 Months Ended

Apr. 30, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets

The following table summarizes intangible assets as of April 30, 2021 and 2020 (in thousands):

	April 30, 2021							April 30, 2020
	Gross							Gross
	Carrying		Accumulated			Net Carrying		Carrying		Accumulated			Net Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	89,980	$	(60,347	)	$	29,633	$	89,980	$	(51,049	)	$	38,931
Developed technology		21,588		(14,456	)		7,132		21,588		(12,529	)		9,059
Patents, trademarks, and trade names		50,007		(34,308	)		15,699		49,697		(29,229	)		20,468
Backlog		1,150		(1,150	)		—		1,150		(1,150	)		—
		162,725		(110,261	)		52,464		162,415		(93,957	)		68,458
Patents in progress		749		—			749		490		—			490
Total definite-lived intangible assets		163,474		(110,261	)		53,213		162,905		(93,957	)		68,948
Indefinite-lived intangible assets		430		—			430		204		—			204
Total intangible assets	$	163,904	$	(110,261	)	$	53,643	$	163,109	$	(93,957	)	$	69,152

Schedule of Future Expected Amortization Expense

The following table represents future expected amortization expense as of April 30, 2021 (in thousands):

Fiscal	Amount
2022		13,876
2023		11,428
2024		9,689
2025		6,047
2026		4,954
Thereafter		6,470
Total	$	52,464