| Significant Accounting Policies (Tables) | 9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Jan. 31, 2021 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accounting Policies [Abstract] | 听 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Property and Equipment Useful Lives | Depreciation and amortization is computed using the straight-line method over the estimated useful lives of the related assets per the following table. 
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| X | ||||||||||
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- Definition Tabular disclosure of useful life of physical assets used in the normal conduct of business and not intended for resale. No definition available. 
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| X | ||||||||||
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- References No definition available. 
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