Intangible Assets

12 Months Ended

Apr. 30, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

10. Intangible Assets

The following table presents a summary of intangible assets as of April 30, 2017 and 2016 (in thousands):

	April 30, 2017							April 30, 2016
	Gross							Gross
	Carrying		Accumulated			Net Carrying		Carrying		Accumulated			Net Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	105,260	$	(16,463	)	$	88,797	$	28,560	$	(6,423	)	$	22,137
Developed technology		19,430		(5,436	)		13,994		16,430		(2,890	)		13,540
Patents, trademarks, and trade names		53,308		(15,619	)		37,689		36,076		(9,262	)		26,814
Backlog		1,150		(1,150	)		—		—		—			—
		179,148		(38,668	)		140,480		81,066		(18,575	)		62,491
Patents in progress		611		—			611		433		—			433
Total definite-lived intangible assets		179,759		(38,668	)		141,091		81,499		(18,575	)		62,924
Indefinite-lived intangible assets		226		—			226		—		—			—
Total intangible assets	$	179,985	$	(38,668	)	$	141,317	$	81,499	$	(18,575	)	$	62,924

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 technology, and five years for patents, trademarks, and trade names. Amortization expense, excluding amortization of deferred financing costs, amounted to $20.1 million, $10.7 million, and $4.6 million for the fiscal years ended April 30, 2017, 2016, and 2015, respectively.

The following table represents future expected amortization expense as of April 30, 2017, which will primarily be recorded in our Outdoor Products & Accessories segment (in thousands):

Fiscal		Amount
2018	$		22,937
2019			23,199
2020			20,367
2021			17,552
2022			14,836
Thereafter			41,589
Total	$		140,480