Annual report pursuant to Section 13 and 15(d)

Goodwill - Additional Information (Detail)

v3.8.0.1
Goodwill - Additional Information (Detail) - USD ($)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Impairment $ 0 $ 0