Balance Sheet Accounts (Narratives) (Details) (USD $)	6 Months Ended		0 Months Ended	1 Months Ended	2 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 31, 2013	Oct. 29, 2014	Dec. 31, 2014	Sep. 30, 2014
Balance Sheet Accounts [Line Items]
Other than temporary impairment loss		$ 148,000
Borrowings under Revolving Facility	24,000,000	35,000,000
Letters for credit outstanding	1,000,000				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
Maximum investment in one obligor or maker (percent)	10.00%
Revolving Facility
Balance Sheet Accounts [Line Items]
Term of agreement			5 years
Borrowing capacity			60,000,000
Borrowings under Revolving Facility						24,000,000
Repayments under Revolving Facility				24,000,000	6,000,000
Remaining borrowing capacity	17,400,000				17,400,000
Term Loan
Balance Sheet Accounts [Line Items]
Term of agreement			5 years
Borrowing capacity			65,000,000
Enterasys Networks, Inc. | Revolving Facility
Balance Sheet Accounts [Line Items]
Borrowings under Revolving Facility			$ 35,000,000
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
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