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Stockholders' Equity - Reconciliation of Net Income/(Loss) 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, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Earnings Per Share [Abstract]
Net (loss)/income	$ 5,731	$ (5,725)	$ 4,916	$ 8,586
Basic earnings, Shares	55,064	54,544	54,919	54,444
Effect of dilutive stock awards, Shares	680		722	688
Diluted earnings, Shares	55,744	54,544	55,641	55,132
Basic earnings, Per Share Amount	$ 0.10	$ (0.10)	$ 0.09	$ 0.16
Diluted earnings, Per Share Amount	$ 0.10	$ (0.10)	$ 0.09	$ 0.16

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