XML 62 R49.htm IDEA: XBRL DOCUMENT v3.7.0.1
Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Property Plant And Equipment [Abstract]      
Depreciation expense $ 2,092 $ 2,201 $ 2,079