Balance Sheet Accounts (Narratives) (Details) - USD ($)	3 Months Ended		6 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Jun. 30, 2015
Balance Sheet Accounts [Line Items]
Inventories	$ 61,679,000			$ 58,014,000
Amortization	8,900,000	$ 9,000,000
Letters for credit outstanding	1,000,000
Standard hardware warranty period			12 months
Standard software warranty period			90 days
Limited lifetime hardware warranty maximum period after end of sale of product			5 years
Revolving Facility
Balance Sheet Accounts [Line Items]
Term of agreement				5 years
Borrowing capacity				$ 50,000,000
Remaining borrowing capacity	37,400,000
Term Loan
Balance Sheet Accounts [Line Items]
Term of agreement				5 years
Borrowing capacity				$ 65,000,000
Minimum
Balance Sheet Accounts [Line Items]
Extended warranty period			1 year
Minimum | Net Revenue | Customer Concentration Risk
Balance Sheet Accounts [Line Items]
Concentration risk			10.00%
Maximum
Balance Sheet Accounts [Line Items]
Extended warranty period			5 years
Cost Of Product Revenue
Balance Sheet Accounts [Line Items]
Amortization	$ 4,400,000	$ 4,500,000
Cash equivalents | Maximum
Balance Sheet Accounts [Line Items]
Maturity period for investments			3 months
Short-term investments | Minimum
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
Marketable securities | Minimum
Balance Sheet Accounts [Line Items]
Maturity period for investments			1 year