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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