Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment - Additional Information (Detail)

v2.4.1.9
Property, Plant and Equipment - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 2,079us-gaap_Depreciation $ 1,977us-gaap_Depreciation $ 1,851us-gaap_Depreciation