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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		9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Net income/(loss)
Income from continuing operations	$ 62,263	$ 4,227	$ 154,679	$ 6,755
Income/(loss) from discontinued operations	127	1,504	8,334	(1,839)
Net income	$ 62,390	$ 5,731	$ 163,013	$ 4,916
Weighted average shares outstanding — Basic	55,137	55,064	55,515	54,919
Effect of dilutive stock awards	565	680	743	722
Weighted average shares outstanding — Diluted	55,702	55,744	56,258	55,641
Earnings/(loss) per share — Basic
Income from continuing operations	$ 1.13	$ 0.08	$ 2.79	$ 0.12
Income/(loss) from discontinued operations		0.02	0.15	(0.03)
Net income	1.13	0.10	2.94	0.09
Earnings/(loss) per share — Diluted
Income from continuing operations	1.12	0.08	2.75	0.12
Income/(loss) from discontinued operations		0.02	0.15	(0.03)
Net income	$ 1.12	$ 0.10	$ 2.90	$ 0.09

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