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Investments in Companies Accounted for Using the Equity Method - Investment in Limited Partnership Fund (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2019 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Equity Method Investments |  |  |  |
Equity method investment loss, net of tax |  | $ (5,487) | $ (3,944) | $ (1,283)
Provision for income taxes |  | 5,848 | 4,641 | 9,800
Carrying value of investment |  | 4,442 |  |
Limited Partnership Fund |  |  |  |
Equity Method Investments |  |  |  |
Capital contributions | $ 5,000 |  |  |
Equity method investment loss, net of tax | 394 |  |  |
Provision for income taxes | 111 |  |  |
Summarized financial information of the equity method investments |  |  |  |
Current assets |  | 67,387 | 31,746 |
Noncurrent assets |  | 170,602 |  |
Current liabilities |  | 72,505 | 11,757 |
Revenue |  | 25 |  |
Gross loss |  | (1,331) |  |
Realized and unrealized losses on investments |  | (7,028) |  |
Net loss |  | $ (85,818) | $ (63,107) | $ (25,666)
Limited Partnership Fund | Long term investments |  |  |  |
Equity Method Investments |  |  |  |
Carrying value of investment | $ 4,442 |  |  |

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