Weighted Average Shares and Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Weighted average common shares outstanding, Basic	19,902,000	20,819,000	20,026,000	20,877,000
Weighted average diluted common and common equivalent shares	20,063,000	21,050,000	20,199,000	21,130,000