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Intangible Assets (Tables) | 9 Months Ended
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Jan. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of 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 |
Schedule of Future Expected Amortization Expense | 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 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived 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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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