Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Operating Segment Information and Concentrations of Risk - Additional Information (Detail)

v2.4.0.6
Operating Segment Information and Concentrations of Risk - Additional Information (Detail)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Segment Reporting Information [Line Items]      
Percentage of net sales individually account for two major customers 10.00% 10.00% 10.00%
Accounts receivable major customer percentage 22.00% 21.00%  
Percentage of net sales 30.00% 33.00%