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Summary of Significant Accounting Policies (Schedule of Concentration Risk) (Details)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Customer A | Gross Sales
Concentration Risk [Line Items]
Concentration credit risk by major customer (as a percent)	13.00%	15.00%	15.00%
Customer A | Accounts Receivable
Concentration Risk [Line Items]
Concentration credit risk by major customer (as a percent)	14.00%	15.00%
Customer B | Gross Sales
Concentration Risk [Line Items]
Concentration credit risk by major customer (as a percent)	14.00%	13.00%	12.00%
Customer B | Accounts Receivable
Concentration Risk [Line Items]
Concentration credit risk by major customer (as a percent)	15.00%	12.00%
Customer C | Accounts Receivable
Concentration Risk [Line Items]
Concentration credit risk by major customer (as a percent)		11.00%

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