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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/(Loss) per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 7,645	$ (2,165)
Basic earnings, Shares	54,345	53,905
Effect of dilutive stock awards, Shares	586
Diluted earnings, Shares	54,931	53,905
Basic earnings, Per Share Amount	$ 0.14	$ (0.04)
Diluted earnings, Per Share Amount	$ 0.14	$ (0.04)

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