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Intangibles | 3 Months Ended
--- | ---
Jul. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangibles | Intangibles The customer relationship intangibles were:
|  | July 31, |  | April 30,
(in thousands) |  | 2021 |  | 2021
Customer relationship intangibles |  | $ | 274,000 |  |  | $ | 274,000 |
Less accumulated amortization |  | (163,639) |  |  | (152,222) |
Total |  | $ | 110,361 |  |  | $ | 121,778 |
Customer relationship intangibles are amortized over the estimated useful lives on a straight-line basis over six years. Amortization expense for the three-month periods ended July 31, 2021 and 2020 was $11.4 million and $12.3 million, respectively.

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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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