Annual report pursuant to Section 13 and 15(d)

Leases - Additional Information (Detail)

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Leases - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Schedule Of Leases [Line Items]      
Operating leases expense $ 563 $ 513 $ 478
Machinery and Equipment [Member]
     
Schedule Of Leases [Line Items]      
Amortization of machinery and equipment under capital leases $ 72 $ 84 $ 82