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Stockholders' Equity - 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, 2021
Jul. 31, 2020
Net income    
Income from continuing operations $ 76,882 $ 43,301
Income from discontinued operations   5,084
Net income $ 76,882 $ 48,385
Weighted average shares outstanding — Basic 48,394 55,494
Effect of dilutive stock awards 656 783
Weighted average shares outstanding — Diluted 49,050 56,277
Earnings per share - Basic    
Income from continuing operations $ 1.59 $ 0.78
Income from discontinued operations   0.09
Net income 1.59 0.87
Earnings per share - Diluted    
Income from continuing operations 1.57 0.77
Income from discontinued operations   0.09
Net income $ 1.57 $ 0.86