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Weighted Average Shares and Net Income Per Share - Additional Information (Detail) - shares
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Basic weighted average common shares outstanding 18,877,000 18,759,000 18,899,000 18,785,000
Diluted weighted average common and common equivalent shares outstanding 19,089,000 18,966,000 19,095,000 18,983,000