Intangible Assets

6 Months Ended

Oct. 31, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

(8) Intangible Assets:

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

	October 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	$	(4,006	)	$	23,854	$	28,260	$	(1,633	)	$	26,627
Developed technology		16,430		(1,848	)		14,582		16,630		(1,014	)		15,616
Patents, trademarks, and tradenames		35,934		(7,062	)		28,872		36,380		(5,303	)		31,077
		80,224		(12,916	)		67,308		81,270		(7,950	)		73,320
Patents in progress		495		—			495		448		—			448
	$	80,719	$	(12,916	)	$	67,803	$	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 tradenames. Amortization expense, excluding amortization of deferred financing costs, amounted to $2.8 million and $376,000 for the three months ended October 31, 2015 and 2014, respectively. Amortization expense, excluding amortization of deferred financing costs, amounted to $5.1 million and $537,000 for the six months ended October 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	$		5,634
2017			10,487
2018			9,741
2019			8,554
2020			7,405
Thereafter			25,487
Total	$		67,308

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 six months ended October 31, 2015 and therefore intangible assets were not tested for impairment.