Summary of Significant Accounting Policies (Concentration Risk) (Details)	12 Months Ended
	Mar. 31, 2016 customer supplier financial_instituion	Mar. 31, 2015 customer supplier	Mar. 31, 2014 customer supplier
Concentration Risk [Line Items]
Number of financial institutions (financial institution) | financial_instituion	3
Sales | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, number of entities	0	1	1
Concentration risk, percentage	10.00%	12.00%	23.00%
Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, number of entities	1	0
U.S. Markets | Cost of Goods | Supplier Concentration Risk
Concentration Risk [Line Items]
Concentration risk, number of entities | supplier	0	0	0