Segment, Geographic Location, and Customer Information - Summary of Total Revenues Derived from Customers (Detail)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Revenue, Major Customer [Line Items]
Net sales	10.00%	10.00%	10.00%	10.00%
Customer A [Member]
Revenue, Major Customer [Line Items]
Net sales	43.00%	29.00%	25.00%	29.00%
Customer B [Member]
Revenue, Major Customer [Line Items]
Net sales	18.00%	20.00%	21.00%	23.00%
Customer C [Member]
Revenue, Major Customer [Line Items]
Net sales		13.00%	13.00%	12.00%
Customer D [Member]
Revenue, Major Customer [Line Items]
Net sales		15.00%		12.00%