Balance Sheet Accounts (Narratives) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Jun. 30, 2015	Jun. 30, 2016
Balance Sheet Accounts [Line Items]
Inventory, net	$ 43,395,000		$ 40,989,000
Outstanding letters of credit	$ 1,000,000
Standard hardware warranty period (in months)	12 months
Standard software warranty period (in days)	90 days
Limited lifetime hardware warranty maximum period after end of sale of product (in years)	5 years
Maximum investment in one obligor or maker (percent)	10.00%
Accounts Receivable | Westcon Group Inc.
Balance Sheet Accounts [Line Items]
Concentration risk (percent)	17.00%
Accounts Receivable | Tech Data Corporation
Balance Sheet Accounts [Line Items]
Concentration risk (percent)	11.00%
Revolving Facility
Balance Sheet Accounts [Line Items]
Credit Agreement term		5 years
Borrowing capacity from Credit Agreement	$ 27,100,000	$ 50,000,000
Term Loan
Balance Sheet Accounts [Line Items]
Credit Agreement term		5 years
Borrowing capacity from Credit Agreement		$ 65,000,000
Maximum
Balance Sheet Accounts [Line Items]
Extended warranty period	5 years
Minimum
Balance Sheet Accounts [Line Items]
Extended warranty period	1 year
Cash equivalents | Maximum
Balance Sheet Accounts [Line Items]
Maturity period for investments	3 months
Short-term investments | Maximum
Balance Sheet Accounts [Line Items]
Maturity period for investments	1 year
Short-term investments | Minimum
Balance Sheet Accounts [Line Items]
Maturity period for investments	3 months