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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