Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Income Tax Disclosure [Abstract]
Income tax (benefit) provision	$ 12,877	$ 15,760	$ 4,205	$ 30,213
Income tax (benefit) provision tax rate	31.40%		294.50%