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Summary of Significant Accounting Policies (Narratives) (Details) (USD $) | 12 Months Ended |  |  |  |  | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 2 Months Ended | 12 Months Ended
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Jun. 30, 2014 Distribution_Channels Investment_Securities | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2014 Minimum | Jun. 30, 2014 Maximum | Jun. 30, 2014 Product | Jun. 30, 2013 Product | Jun. 30, 2014 Services | Jun. 30, 2013 Services | Jun. 30, 2014 Available-for-sale Securities Government and Corporate Debt Securities | Jun. 30, 2014 Marketable Securities Minimum | Oct. 31, 2013 Revolving Credit Facility | Jun. 30, 2014 Revolving Credit Facility | Oct. 31, 2013 Term Loan Facility | Oct. 31, 2013 Senior Secured Credit Facilities [Member] | Oct. 31, 2013 Senior Secured Credit Facilities [Member] Minimum | Oct. 31, 2013 Senior Secured Credit Facilities [Member] Maximum | Oct. 31, 2013 Federal Funds Effective Rate Senior Secured Credit Facilities [Member] | Jun. 30, 2014 Enterasys Networks, Inc. | Oct. 31, 2013 Enterasys Networks, Inc. Revolving Credit Facility | Jun. 30, 2014 Enterasys Networks, Inc. Revolving Credit Facility | Jun. 30, 2014 Cost Of Product Revenue | Jun. 30, 2013 Cost Of Product Revenue | Jun. 30, 2012 Cost Of Product Revenue | Aug. 27, 2014 Subsequent Event Revolving Credit Facility | Jun. 30, 2014 Buildings | Jun. 30, 2014 Computer Equipment Minimum | Jun. 30, 2014 Computer Equipment Maximum | Jun. 30, 2014 Purchased Software Minimum | Jun. 30, 2014 Purchased Software Maximum | Jun. 30, 2014 Office Equipment Minimum | Jun. 30, 2014 Office Equipment Maximum | Jun. 30, 2014 Furniture and Fixtures Minimum | Jun. 30, 2014 Furniture and Fixtures Maximum | Jun. 30, 2014 Leasehold Improvements Minimum | Jun. 30, 2014 Leasehold Improvements Maximum
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue from customers other than distributors |  |  |  |  |  | $ 4,100,000 | $ 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred product revenue from customers other than distributors | 97,677,000 | 41,454,000 |  |  |  |  |  | 97,700,000 | 38,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of distribution channels | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory, net | 57,109,000 | 16,167,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory write-down |  | 800,000 | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period for investments (in months and years) |  |  |  |  |  |  |  |  |  | 3 years | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities with unrealized losses (in securities) | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of investment securities (in securities) | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other-than-temporary impairment loss | 158,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, carrying amount | 121,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, estimated fair value | 121,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of property and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 years | 1 year | 4 years | 1 year | 4 years | 5 years | 7 years | 5 years | 7 years | 2 years | 10 years
Increase in property and equipment for asset retirement obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 70,877,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense | 28,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,900,000 | 1,500,000 | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Service inventory held to support customers | 11,400,000 | 6,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extended warranty contracts period (in years) |  |  |  | 1 year | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity from Credit Agreement |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |  | 65,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Draw downs from Revolving Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,000,000 | 48,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments to Revolving Facility |  |  |  |  |  |  |  |  |  |  |  |  | 24,000,000 |  |  |  |  |  |  |  |  |  |  |  | 24,000,000 |  |  |  |  |  |  |  |  |  |  |
Basis spread on Senior Secured Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 0.375% | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising expenses | $ 500,000 | $ 200,000 | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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