Weighted Average Shares and Net Income Per Share - Calculations of Basic and Diluted Weighted Shares (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
NET INCOME	$ 7,491,000	$ 6,900,000
Basic:
Weighted average common shares outstanding	19,572,000	20,149,000
Net Income per share, Basic	$ 0.38	$ 0.34
Diluted:
Weighted average common shares outstanding	19,572,000	20,149,000
Treasury stock impact of stock options	182,000	186,000
Total common and common equivalent shares	19,754,000	20,335,000
Net Income per share, Diluted	$ 0.38	$ 0.34