Weighted Average Shares and Net Income Per Share - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Weighted average common shares outstanding, Basic	20,819,000	21,138,000	20,877,000	21,267,000
Weighted average diluted common and common equivalent shares	21,050,000	21,377,000	21,130,000	21,481,000