Stockholders' Equity - Reconciliation of Net Income Amounts and Weighted Average Number of Common and Common Equivalent Shares Used to Determine Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Net income
Income from continuing operations	$ 3,312	$ 76,882
Income from discontinued operations	0	0
Net income	$ 3,312	$ 76,882
Weighted average shares outstanding — Basic	45,739	48,394
Effect of dilutive stock awards	363	656
Weighted average shares outstanding — Diluted	46,102	49,050
Earnings per share - Basic
Net income	$ 0.07	$ 1.59
Earnings per share - Diluted
Net income	$ 0.07	$ 1.57