Annual report pursuant to Section 13 and 15(d)

Leases - Additional Information (Detail)

v3.8.0.1
Leases - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Capital Leased Assets [Line Items]      
Operating leases expense $ 581 $ 615 $ 677
Machinery and Equipment [Member]      
Capital Leased Assets [Line Items]      
Amortization of machinery and equipment under capital leases $ 73 $ 54 $ 40