Intangible Assets

3 Months Ended

Jul. 31, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

(7) Intangible Assets:

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

	July 31, 2015							April 30, 2015
	Gross							Gross
	Carrying		Accumulated			Net Carrying		Carrying		Accumulated			Net Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	27,860	$	(2,813	)	$	25,047	$	28,260	$	(1,633	)	$	26,627
Developed technology		16,430		(1,327	)		15,103		16,630		(1,014	)		15,616
Patents, trademarks, and tradenames		35,804		(5,959	)		29,845		36,380		(5,303	)		31,077
		80,094		(10,099	)		69,995		81,270		(7,950	)		73,320
Patents in progress		541		—			541		448		—			448
	$	80,635	$	(10,099	)	$	70,536	$	81,718	$	(7,950	)	$	73,768

Intangible assets with determinable lives are amortized over their estimated useful lives and are also reviewed for impairment if events or changes in circumstances indicate that their carrying amount may not be recoverable.

Intangible assets with determinable lives are being 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 tradenames. Amortization expense, excluding amortization of deferred financing costs, amounted to $2.2 million and $161,000 for the three months ended July 31, 2015 and 2014, respectively.

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

Fiscal		Amount
2016	$		8,446
2017			10,480
2018			9,735
2019			8,547
2020			7,399
Thereafter			25,388
Total	$		69,995

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 three months ended July 31, 2015, and therefore intangible assets were not tested for impairment.