Description Of Business And Summary Of Significant Accounting Policies (Concentration of Credit Risk, Significant Customers and Channel Partners) (Details)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Accounts Receivable [Member] | Customer Concentration Risk - Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	27.00%	26.00%
Accounts Receivable [Member] | Customer Concentration Risk - Customer B [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	22.00%	24.00%
Accounts Receivable [Member] | Customer Concentration Risk - Customer C [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	11.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	64.00%
Product Concentration Risk [Member] | Sales Revenue, Product Line [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	70.00%	67.00%	66.00%