Description Of Business And Summary Of Significant Accounting Policies (Concentration of Credit Risk, Significant Customers and Channel Partners) (Details)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Accounts Receivable [Member] | Customer Concentration Risk - Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	39.00%	27.00%
Accounts Receivable [Member] | Customer Concentration Risk - Customer B [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	21.00%	22.00%
Accounts Receivable [Member] | Customer Concentration Risk - Customer C [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	10.00%	11.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	67.00%	64.00%	62.00%
Product Concentration Risk [Member] | Sales Revenue, Product Line [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	70.00%	70.00%	67.00%