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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		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Earnings Per Share [Abstract]
Net (loss)/income	$ 1,293	$ 6,665	$ (815)	$ 14,310
Basic earnings, Shares	54,912	54,444	54,847	54,395
Effect of dilutive stock awards, Shares	512	663		652
Diluted earnings, Shares	55,424	55,107	54,847	55,047
Basic earnings, Per Share Amount	$ 0.02	$ 0.12	$ (0.01)	$ 0.26
Diluted earnings, Per Share Amount	$ 0.02	$ 0.12	$ (0.01)	$ 0.26

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