Stockholder's Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Feb. 16, 2021	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2022	May 21, 2021
Stockholders' Equity Note [Abstract]
Common stock, shares issued	6,181,250
Common stock, per share	$ 36.00	$ 0.001		$ 0.001
Option to purchase additional shares of common stock	806,250
Cash proceeds from issuance of common stock	$ 209,200,000	$ 210,582,000	$ 11,422,000
Maximum aggregate public offering price of securities to be issued under shelf registration statement					$ 300,000,000