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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, 2015	Jul. 31, 2014
Earnings Per Share [Abstract]
Net income	$ 14,412	$ 14,556
Basic earnings, Shares	54,218	54,829
Effect of dilutive stock awards, Shares	1,259	1,316
Diluted earnings, Shares	55,477	56,145
Basic	$ 0.27	$ 0.27
Effect of dilutive stock awards	(0.01)	(0.01)
Diluted earnings	$ 0.26	$ 0.26

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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