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Business combinations (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 9 Months Ended |  | 0 Months Ended | 3 Months Ended | 9 Months Ended |
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Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013 | Oct. 31, 2013 Term Loan | Oct. 31, 2013 Revolving Facility | Mar. 31, 2014 Enterasys Networks, Inc. | Dec. 31, 2013 Enterasys Networks, Inc. | Oct. 31, 2013 Enterasys Networks, Inc. | Mar. 31, 2013 Enterasys Networks, Inc. | Mar. 31, 2014 Enterasys Networks, Inc. | Mar. 31, 2013 Enterasys Networks, Inc. | Mar. 31, 2014 Enterasys Networks, Inc. In-process research and development
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid in acquisition |  |  |  | $ 180,000,000 | $ 0 |  |  | $ 180,000,000 | $ 180,000,000 | $ 180,000,000 |  |  |  |
Borrowing capacity |  |  |  |  |  | 65,000,000 | 60,000,000 |  |  |  |  |  |  |
Increase (decrease) in net income (loss) |  |  | (400,000) |  |  |  |  |  |  |  |  |  |  |
Net income (loss), including measurement period adjustments |  |  | (16,400,000) |  |  |  |  |  |  |  | (21,166,000) | (63,410,000) | (35,999,000) |
Fair value of indefinite lived intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000
Acquiree actual revenue |  |  |  |  |  |  |  |  |  |  |  | 148,300,000 |  |
Acquiree actual operating income |  |  |  |  |  |  |  |  |  |  |  | 27,500,000 |  |
Acquisition and integration costs | $ 6,443,000 | $ 0 |  | $ 18,826,000 | $ 0 |  |  |  |  |  |  | $ 5,900,000 |  |

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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