Segment and Geographic Information - Net Sales of 10% or More of Total Revenues Derived from Customers (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Customer A
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 25,370	$ 19,782	$ 24,707
Customer B
Entity Wide Revenue Major Customer [Line Items]
Net sales	11,924	14,764	18,549
Customer C
Entity Wide Revenue Major Customer [Line Items]
Net sales	11,032	10,622	10,428
Customer D
Entity Wide Revenue Major Customer [Line Items]
Net sales			$ 9,452