Quarterly report pursuant to Section 13 or 15(d)

Income Per Share - Reconciliation of Numerators and Denominators of Basic and Diluted Income Per Share (Detail)

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Income Per Share - Reconciliation of Numerators and Denominators of Basic and Diluted Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Summary Of Basic And Diluted Earnings Per Share [Abstract]        
Net income $ 1,274 $ 3,992 $ 5,611 $ 10,570
Denominator:        
Weighted average common shares outstanding 9,922 10,127 10,051 10,119
Basic income per share $ 0.13 $ 0.39 $ 0.56 $ 1.04
Denominator:        
Weighted average common shares outstanding 9,922 10,127 10,051 10,119
Stock options outstanding 5 22 8 23
Weighted average common and potential common shares outstanding 9,927 10,149 10,059 10,142
Diluted income per share $ 0.13 $ 0.39 $ 0.56 $ 1.04