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Weighted Average Shares and Net Income Per Share - Calculations of Basic and Diluted Weighted Average Shares (Detail) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net Income $ 12,789,000 $ 8,393,000 $ 24,567,000 $ 17,168,000
Basic:        
Weighted average common shares outstanding 18,877,000 18,759,000 18,899,000 18,785,000
Net Income per share $ 0.68 $ 0.45 $ 1.30 $ 0.91
Diluted:        
Weighted average common shares outstanding 18,877,000 18,759,000 18,899,000 18,785,000
Treasury stock impact of stock options 212,000 207,000 196,000 198,000
Total common and common equivalent shares 19,089,000 18,966,000 19,095,000 18,983,000
Net Income per share $ 0.67 $ 0.44 $ 1.29 $ 0.90