Revenues (Schedule of Major Customers Accounting for 10% or More of Net Revenues and Accounts Receivable Balance) (Details) - Customer Concentration Risk	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Westcon Group Inc. | Net Revenue
Concentration Risk [Line Items]
Concentration risk (percent)	15.00%	14.00%	14.00%	15.00%
Westcon Group Inc. | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk (percent)			23.00%
Jenne Corporation | Net Revenue
Concentration Risk [Line Items]
Concentration risk (percent)	12.00%		12.00%	10.00%
Jenne Corporation | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk (percent)					13.00%
Tech Data Corporation | Net Revenue
Concentration Risk [Line Items]
Concentration risk (percent)	22.00%	12.00%	19.00%	12.00%
Tech Data Corporation | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk (percent)			22.00%		17.00%