Weighted Average Shares and Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	17,841,000	17,937,000	17,869,000	17,960,000
Diluted weighted average common and common equivalent shares outstanding	18,232,000	18,174,000	18,226,000	18,144,000