Segment, Geographic Location, and Customer Information - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Segment	Sep. 30, 2012	Mar. 31, 2013
Revenues From External Customers And Long Lived Assets [Line Items]
Number of reportable segments			1
Percentage of net sales made to customers	10.00%	10.00%	10.00%	10.00%
Customers accounted for more than ten percent of accounts receivables	3		3		3
Customer 1
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of accounts receivable from major customers	33.00%		33.00%		17.00%
Customer 2
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of accounts receivable from major customers	21.00%		21.00%		14.00%
Customer 3
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of accounts receivable from major customers	10.00%		10.00%		11.00%