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Intangibles (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands | Jan. 31, 2020 | Apr. 30, 2019
--- | --- | ---
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangibles, gross | $ 274,000 | $ 274,000
Less accumulated amortization | (95,139) | (60,889)
Intangibles, net | 178,861 | 213,111
Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangibles, gross | 10,000 | 10,000
Less accumulated amortization | (6,944) | (4,445)
Intangibles, net | $ 3,056 | $ 5,555

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