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Summary of Significant Accounting Policies, Recently Issued and Recently Adopted Accounting Standards, Recently Adopted and Issued Accounting Standards (Details) - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 30, 2019
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ROU Assets and Liabilities [Abstract] |  |
Operating lease, liability | $ 181,592 |
Operating Lease Right-of-Use Assets | 142,716 | $ 0
ASU 2016-02 [Member] | Minimum [Member] |  |
ROU Assets and Liabilities [Abstract] |  |
Operating lease, liability | 178,000 |
Operating Lease Right-of-Use Assets | $ 142,000 |

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