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Related Party Transactions (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020
Related Party Transaction [Line Items] |  |  |  |
Due to related parties | $ 4,000 |  | $ 4,000 |
Board Member | Board Member One |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, amounts of transaction | 12,000 | $ 18,000 | 45,000 | $ 54,000
Board Member | Board Member Two |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, amounts of transaction | $ 3,900 | $ 10,100 | $ 13,400 | $ 39,100

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