Balance Sheet Accounts (Narratives) (Details) (USD $)	3 Months Ended		6 Months Ended						0 Months Ended				0 Months Ended	3 Months Ended		6 Months Ended		0 Months Ended		6 Months Ended		0 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended
	Dec. 31, 2013 Investment_Securities	Dec. 31, 2012	Dec. 31, 2013 Investment_Securities	Dec. 31, 2012	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Oct. 31, 2013 Senior Secured Credit Facilities	Oct. 31, 2013 Senior Secured Credit Facilities Federal Funds Effective Rate	Oct. 31, 2013 Revolving Facility	Dec. 31, 2013 Revolving Facility	Oct. 31, 2013 Term Loan	Dec. 31, 2013 Cost of Product Revenue	Dec. 31, 2012 Cost of Product Revenue	Dec. 31, 2013 Cost of Product Revenue	Dec. 31, 2012 Cost of Product Revenue	Oct. 31, 2013 Enterasys Networks, Inc.	Sep. 11, 2012 Santa Clara Headquarters acre	Dec. 31, 2013 Minimum	Dec. 31, 2013 Minimum Net Revenue Customer Concentration Risk	Oct. 31, 2013 Minimum Senior Secured Credit Facilities	Dec. 31, 2013 Maximum	Oct. 31, 2013 Maximum Senior Secured Credit Facilities	Dec. 31, 2013 Cash equivalents Maximum	Dec. 31, 2013 Short-term Investments Minimum	Dec. 31, 2013 Short-term Investments Maximum	Dec. 31, 2013 Marketable Securities Minimum
Balance Sheet Accounts [Line Items]
Maturity period for investments																									3 months	3 months	1 year	1 year
Number of securities with unrealized losses	5		5
Number of investment securities	25		25
Other than temporary impairment loss on investments	$ 148,000
Number of acres of land sold																			16
Net cash proceeds from sale of real estate			0	42,659,000															44,700,000
Gain on sale of property	0	0	0	11,539,000															11,500,000
Goodwill acquired																		57,900,000
Amortization expense	6,700,000	400,000	6,997,000	801,000										2,900,000	400,000	3,200,000	800,000
Extended warranty period																				1 year			5 years
Borrowing capacity									125,000,000		60,000,000		65,000,000
Term of agreement											5 years		5 years
Amount outstanding on revolving credit facility												35,000,000
Basis spread										0.50%
Commitment fee percentage									0.50%													0.375%		0.50%
Warranty liability	7,479,000	2,971,000	7,479,000	2,971,000	3,440,000	3,296,000	2,971,000	2,871,000
Current portion of warranty liability	$ 4,600,000		$ 4,600,000
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%
Concentration risk																					10.00%