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Weighted Average Shares and Net Income Per Share - Calculations of Basic and Diluted Weighted Average Common Shares (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net Income $ 27,906,000 $ 23,398,000 $ 55,141,000 $ 44,975,000
Basic:        
Weighted average common shares outstanding 51,314,000 51,399,000 51,333,000 51,381,000
Net Income per share $ 0.54 $ 0.46 $ 1.07 $ 0.88
Diluted:        
Weighted average common shares outstanding 51,723,000 52,023,000 51,817,000 51,981,000
Treasury stock impact of stock options 409,000 624,000 484,000 600,000
Total common and common equivalent shares 51,723,000 52,023,000 51,817,000 51,981,000
Net Income per share $ 0.54 $ 0.45 $ 1.06 $ 0.87