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Intangible Assets | 3 Months Ended
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Jul. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | (9) Intangible Assets: The following table presents a summary of intangible assets as of July 31, 2018 and April 30, 2018 (in thousands):
|  | July 31, 2018 |  |  | April 30, 2018 |
|  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Carrying |  |  | Accumulated |  |  | Net Carrying |  |  | Carrying |  |  | Accumulated |  |  | Net Carrying |
|  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships |  | $ | 92,360 |  |  | $ | (30,719 | ) |  | $ | 61,641 |  |  | $ | 92,360 |  |  | $ | (28,252 | ) |  | $ | 64,108 |
Developed technology |  |  | 21,130 |  |  |  | (9,461 | ) |  |  | 11,669 |  |  |  | 21,130 |  |  |  | (8,178 | ) |  |  | 12,952 |
Patents, trademarks, and trade names |  |  | 56,879 |  |  |  | (23,840 | ) |  |  | 33,039 |  |  |  | 56,718 |  |  |  | (22,099 | ) |  |  | 34,619 |
Backlog |  |  | 1,150 |  |  |  | (1,150 | ) |  |  | — |  |  |  | 1,150 |  |  |  | (1,150 | ) |  |  | — |
|  |  | 171,519 |  |  |  | (65,170 | ) |  |  | 106,349 |  |  |  | 171,358 |  |  |  | (59,679 | ) |  |  | 111,679 |
Patents in progress |  |  | 879 |  |  |  | — |  |  |  | 879 |  |  |  | 855 |  |  |  | — |  |  |  | 855 |
Total definite-lived intangible assets |  |  | 172,398 |  |  |  | (65,170 | ) |  |  | 107,228 |  |  |  | 172,213 |  |  |  | (59,679 | ) |  |  | 112,534 |
Indefinite-lived intangible assets |  |  | 226 |  |  |  | — |  |  |  | 226 |  |  |  | 226 |  |  |  | — |  |  |  | 226 |
Total intangible assets |  | $ | 172,624 |  |  | $ | (65,170 | ) |  | $ | 107,454 |  |  | $ | 172,439 |  |  | $ | (59,679 | ) |  | $ | 112,760 |
We amortize intangible assets with determinable lives over a weighted-average period of approximately five 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 $5.4 million and $5.7 million for the three months ended July 31, 2018 and 2017, respectively. Estimated amortization expense of intangible assets for the remainder of fiscal 2019 and succeeding fiscal years is as follows:
Fiscal |  | Amount |
2019 |  | $ | 16,449 |
2020 |  |  | 19,114 |
2021 |  |  | 16,506 |
2022 |  |  | 14,125 |
2023 |  |  | 11,762 |
Thereafter |  |  | 28,393 |
Total |  | $ | 106,349 |
On an annual basis, or more frequently if events or changes in circumstances indicate that the asset might be impaired, we evaluate the fair value of the definite and indefinite-lived intangible assets to determine if an impairment charge is required. We performed our most recent annual impairment review as of February 1, 2018. There were no events or changes in circumstances that would indicate the fair value of intangible assets was reduced below its carrying value during the three months ended July 31, 2018, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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