Weighted Average Shares and Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Weighted average common shares outstanding, Basic	19,581,000	19,902,000	19,577,000	20,026,000
Weighted average diluted common and common equivalent shares	19,733,000	20,063,000	19,743,000	20,199,000