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Intangible Assets | 9 Months Ended
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Jan. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | (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.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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