Intangible Assets

12 Months Ended

Apr. 30, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

7. Intangible Assets

The following table summarizes intangible assets as of April 30, 2022 and 2021 (in thousands):


	April 30, 2022							April 30, 2021
	Gross							Gross
	Carrying		Accumulated			Net Carrying		Carrying		Accumulated			Net Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	89,980	$	(67,955	)	$	22,025	$	89,980	$	(60,347	)	$	29,633
Developed software and technology		25,812		(19,395	)		6,417		25,592		(17,183	)		8,409
Patents, trademarks, and trade names		68,663		(39,030	)		29,633		50,007		(34,308	)		15,699
		184,455		(126,380	)		58,075		165,579		(111,838	)		53,741
Patents and software in development		4,689		—			4,689		749		—			749
Total definite-lived intangible assets		189,144		(126,380	)		62,764		166,328		(111,838	)		54,490
Indefinite-lived intangible assets		430		—			430		430		—			430
Total intangible assets	$	189,574	$	(126,380	)	$	63,194	$	166,758	$	(111,838	)	$	54,920

We amortize intangible assets with determinable lives over a weighted-average period of approximately five years. The weighted-average periods of amortization by intangible asset class is approximately five years for customer relationships, six years for developed software and technology, and six years for patents, trademarks, and trade names. Amortization expense amounted to $14.5 million, $16.8 million, and $18.9 million for the fiscal years ended April 30, 2022, 2021, and 2020, respectively.

The following table represents future expected amortization expense as of April 30, 2022 (in thousands):


Fiscal	Amount
2023	$	12,757
2024		12,345
2025		8,575
2026		7,393
2027		5,068
Thereafter		11,937
Total	$	58,075

We did not record any impairment charges for long-lived intangible assets in the fiscal years ended April 30, 2022, 2021, and 2020, respectively, excluding the goodwill adjustments noted below.