Balance Sheet Accounts (Narratives) (Details) - USD ($)		3 Months Ended
	May 01, 2018	Sep. 30, 2018	Sep. 30, 2017
Balance Sheet Accounts [Line Items]
Outstanding letters of credit		$ 1,300,000
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%
Interest Expense
Balance Sheet Accounts [Line Items]
Amortization of deferred financing costs		$ 200,000	$ 200,000
Second Amendment
Balance Sheet Accounts [Line Items]
Termination date	May 01, 2018
Credit Agreement
Balance Sheet Accounts [Line Items]
Borrowings under Term Loan	$ 200,000,000
Credit Agreement | Term Loan
Balance Sheet Accounts [Line Items]
Credit Facility, term	5 years
Amount borrowed under Term Loan	$ 190,000,000
Credit Agreement | Revolving Facility
Balance Sheet Accounts [Line Items]
Credit Facility, term	5 years
Borrowing capacity from Credit Agreement	$ 40,000,000
Commitment fee	0.35%
Borrowings available under facility		$ 38,700,000
Minimum
Balance Sheet Accounts [Line Items]
Extended warranty period		1 year
Minimum | Credit Agreement | London Interbank Offered Rate (LIBOR)
Balance Sheet Accounts [Line Items]
Borrowings, interest rate	1.50%
Minimum | Credit Agreement | Adjusted Base Rate
Balance Sheet Accounts [Line Items]
Borrowings, interest rate	0.50%
Minimum | Credit Agreement | Revolving Facility
Balance Sheet Accounts [Line Items]
Commitment fee	0.25%
Maximum
Balance Sheet Accounts [Line Items]
Extended warranty period		5 years
Maximum | Credit Agreement
Balance Sheet Accounts [Line Items]
Additional incremental loan facility	$ 100,000,000
Maximum | Credit Agreement | London Interbank Offered Rate (LIBOR)
Balance Sheet Accounts [Line Items]
Borrowings, interest rate	2.75%
Maximum | Credit Agreement | Adjusted Base Rate
Balance Sheet Accounts [Line Items]
Borrowings, interest rate	1.75%
Maximum | Credit Agreement | Revolving Facility
Balance Sheet Accounts [Line Items]
Commitment fee	0.40%