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Nature of Operations - Additional Information (Details) - CAD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2024
Jan. 31, 2023
Apr. 30, 2023
Disclosure Of Nature Of Operations [Abstract]          
Operating losses $ 2,940 $ 4,699 $ 9,132 $ 21,431  
Accumulated deficit 82,220   82,220   $ 73,088
Cash on hand $ 6,300   $ 6,300