Summary of Significant Accounting Policies (Details 4)	12 Months Ended
	Mar. 31, 2014 item	Mar. 31, 2013 item	Mar. 31, 2012 item
Minimum
Concentration of Credit Risk
Customer payment term	30 days
Maximum
Concentration of Credit Risk
Customer payment term	60 days
Accounts receivable | Credit concentration
Concentration of Credit Risk
Number of major customer	1	1
Concentration credit risk by major customer (as a percent)	14.00%	14.00%
Accounts receivable | Credit concentration | Single customer group | Peripherals
Concentration of Credit Risk
Number of major customer	1	1
Concentration credit risk by major customer (as a percent)	14.00%	14.00%
Consolidated net sales | Customer Concentration | Single customer group | Peripherals
Concentration of Credit Risk
Number of major customer	1	1	1
Concentration credit risk by major customer (as a percent)	14.00%	11.00%	14.00%