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Intangibles | 9 Months Ended
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Jan. 31, 2018
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 |  |  | $ | 3,806 |  |  | $ | 270,194 |
Trademarks |  | 3 years |  | Straight-line |  | 10,000 |  |  | 278 |  |  | 9,722 |
Intangible assets, net |  |  |  |  |  |  |  | $ | 4,084 |  |  | $ | 279,916 |
Amortization expense for the nine months ended January 31, 2018 was $4.1 million. Based on the carrying amounts of amortizable intangible assets noted above, estimated amortization expense for the next five 12-month periods beginning in January 31, 2018 is $49.0 million, $49.0 million, $48.7 million, $45.7 million and $45.7 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://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=66006027&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=66006027&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=66006027&loc=d3e16373-109275 + Details
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