Intangible Assets

9 Months Ended

Jan. 31, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

(8) Intangible Assets:

The following table presents a summary of intangible assets as of January 31, 2016 and April 30, 2015 (in thousands):

	January 31, 2016							April 30, 2015
	Gross							Gross
	Carrying		Accumulated			Net Carrying		Carrying		Accumulated			Net Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	27,860	$	(5,198	)	$	22,662	$	28,260	$	(1,633	)	$	26,627
Developed technology		16,430		(2,369	)		14,061		16,630		(1,014	)		15,616
Patents, trademarks, and trade names		36,095		(8,171	)		27,924		36,380		(5,303	)		31,077
		80,385		(15,738	)		64,647		81,270		(7,950	)		73,320
Patents in progress		367		—			367		448		—			448
	$	80,752	$	(15,738	)	$	65,014	$	81,718	$	(7,950	)	$	73,768

Intangible assets with determinable lives are amortized over a weighted-average period of approximately six 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 $2.8 million and $1.6 million for the three months ended January 31, 2016 and 2015, respectively. Amortization expense, excluding amortization of deferred financing costs, amounted to $7.9 million and $4.6 million for the nine months ended January 31, 2016 and 2015, respectively.

Estimated amortization expense of intangible assets for the remainder of fiscal 2016 and succeeding fiscal years is as follows:

Fiscal		Amount
2016	$		2,819
2017			10,501
2018			9,755
2019			8,568
2020			7,420
Thereafter			25,584
Total	$		64,647

On an annual basis, or more frequently if events or changes in circumstances indicate that the asset might be impaired, the fair value of the indefinite-lived intangible assets is evaluated to determine if an impairment charge is required. We performed our most recent annual impairment review as of February 1, 2015. There were no events or changes in circumstances that would indicate the fair value of intangible assets was reduced to below its carrying value during the nine months ended January 31, 2016, and therefore intangible assets were not tested for impairment.