Quarterly report pursuant to Section 13 or 15(d)

Income Per Share - Additional Information (Detail)

v3.8.0.1
Income Per Share - Additional Information (Detail) - shares
shares in Thousands
6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]    
Antidilutive securities excluded from computation of earnings per share 16 16