Weighted Average Shares and Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	17,937,000	18,452,000	17,960,000	18,488,000
Diluted weighted average common and common equivalent shares outstanding	18,174,000	18,771,000	18,144,000	18,779,000