Significant Accounting Policies - Schedule of Dilutive Securities Included In Computation of Net Income Per Share (Detail) shares in Thousands	3 Months Ended
	Jul. 31, 2021 shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted Average Number of Shares Outstanding, Diluted, Adjustment	238
Restricted Stock Units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted Average Number of Shares Outstanding, Diluted, Adjustment	159
Deferred Stock Units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted Average Number of Shares Outstanding, Diluted, Adjustment	79