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Intangibles | 9 Months Ended
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Jan. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangibles | Intangibles The components of intangible assets were:
(in thousands) |  | Weighted Average Amortization Period |  | Amortization Method |  | Cost |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships |  | 6 years |  | Straight-line |  | $ | 274,000 |  |  | $ | 49,472 |  |  | $ | 224,528 |
Trademarks |  | 3 years |  | Straight-line |  | 10,000 |  |  | 3,611 |  |  | 6,389 |
Intangible assets, net |  |  |  |  |  |  |  | $ | 53,083 |  |  | $ | 230,917 |
Amortization expense for the three- and nine-months ended January 31, 2019 was $12.2 million and $36.7 million, respectively. Amortization expense for the three- and nine-months ended January 31, 2018 was $4.1 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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