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Business combinations (Estimated Purchase Price) (Details) (USD $) | 9 Months Ended |  |  |  | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2014 Enterasys Networks, Inc. | Dec. 31, 2013 Enterasys Networks, Inc. | Oct. 31, 2013 Enterasys Networks, Inc. | Mar. 31, 2014 Enterasys Networks, Inc. | Dec. 31, 2013 Enterasys Networks, Inc. | Oct. 31, 2013 Enterasys Networks, Inc. Order backlog | Mar. 31, 2014 Enterasys Networks, Inc. Order backlog | Mar. 31, 2014 Enterasys Networks, Inc. Order backlog Previously Reported | Mar. 31, 2014 Enterasys Networks, Inc. Cash
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  | $ 7,397,000 | $ 4,969,000 |  | $ 7,397,000 |  | $ 4,969,000 |  |  |  |
Receivables |  |  |  |  |  | 23,271,000 | 25,699,000 |  | 23,271,000 |  | 25,699,000 |  |  |  |
Inventory |  |  |  |  |  | 33,662,000 | 33,662,000 |  | 33,662,000 |  | 33,662,000 |  |  |  |
Other current assets |  |  |  |  |  | 8,888,000 | 8,888,000 |  | 8,888,000 |  | 8,888,000 |  |  |  |
Property and equipment |  |  |  |  |  | 21,293,000 | 23,122,000 |  | 21,293,000 |  | 23,122,000 |  |  |  |
Identifiable intangible assets |  |  |  |  |  | 108,900,000 | 108,900,000 |  | 108,900,000 |  | 108,900,000 |  |  |  |
In-process research and development |  |  |  |  |  | 3,000,000 | 3,000,000 |  | 3,000,000 |  | 3,000,000 |  |  |  |
Deferred tax assets |  |  |  |  |  | 9,000 | 9,000 |  | 9,000 |  | 9,000 |  |  |  |
Other assets |  |  |  |  |  | 7,343,000 | 7,343,000 |  | 7,343,000 |  | 7,343,000 |  |  |  |
Goodwill | 64,537,000 |  | 57,922,000 | 0 | 0 | 64,537,000 | 57,922,000 |  | 64,537,000 |  | 57,922,000 |  |  |  |
Current liabilities |  |  |  |  |  | (76,709,000) | (75,394,000) |  | (76,709,000) |  | (75,394,000) |  |  |  |
Other long-term liabilities |  |  |  |  |  | (14,194,000) | (13,151,000) |  | (14,194,000) |  | (13,151,000) |  |  |  |
Total purchase price allocation |  |  |  |  |  | 187,397,000 | 184,969,000 |  | 187,397,000 |  | 184,969,000 |  |  |  |
Less: Cash acquired from acquisition |  |  |  |  |  | (7,397,000) | (4,969,000) |  |  |  |  |  |  |  |
Total purchase price consideration, net of cash acquired | 180,000,000 | 0 |  |  |  | 180,000,000 | 180,000,000 | 180,000,000 |  |  |  |  |  |  |
Change during the period, Cash |  |  |  |  |  |  |  |  | 2,428,000 | [1] |  |  |  |  |
Change during the period, Receivables |  |  |  |  |  |  |  |  | (2,428,000) | [1] |  |  |  |  |
Change during the period, Property and equipment |  |  |  |  |  |  |  |  | (1,829,000) | [2] |  |  |  |  |
Change during period, Identifiable intangible assets |  |  |  |  |  |  |  |  | 0 | [3] |  |  |  |  |
Change during the period, Goodwill |  |  |  |  |  |  |  |  | 6,615,000 |  |  |  |  |  | 2,400,000
Change during the period, Current Liabilities |  |  |  |  |  |  |  |  | (1,315,000) | [2],[4],[5] |  |  |  |  |
Change during the period, Other long-term liabilities |  |  |  |  |  |  |  |  | (1,043,000) | [2] |  |  |  |  |
Change during the period, Total purchase price allocation |  |  |  |  |  |  |  |  | 2,428,000 |  |  |  |  |  |
Change during the period, Cash acquired from acquisition |  |  |  |  |  |  |  |  | (2,428,000) | [1] |  |  |  |  |
Increase (decrease) in property and equipment, excluding asset retirement assets |  |  |  |  |  |  |  |  | (3,000,000) |  |  |  |  |  |
Increase (decrease) in asset retirement assets |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |
Increase (decrease) in current liabilities |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |
Estimated Useful Life |  |  |  |  |  |  |  | 3 years |  |  |  | 1 year | 1 year | 1 year 6 months |
Increase (decrease) in amortization expense |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |  |
Amortization expense including change in estimate |  |  |  |  |  |  |  |  |  |  | 4,600,000 |  |  |  |
Increase (decrease) in current liabilities for litigation and statutory tax assessments |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |
Increase (decrease) for accrued liabilities |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |
Increase (decrease) in operating expenses |  |  |  |  |  |  |  |  |  |  | $ (500,000) |  |  |  |
[1] | The Company finalized the working capital adjustment during the three months ended March 31, 2014, which led to a decrease of $2.4 million in receivables and a corresponding increase in cash. As a result of this adjustment, the total cash acquired from the acquisition also increased by the same amount. The net effect of this adjustment is an increase in goodwill of $2.4 million.
[2] | The Company updated its preliminary estimate of the fair value of property and equipment which led to a decrease of $3.0 million in property and equipment with a corresponding increase in goodwill. The Company also updated the fair values of the asset retirement obligations and the related asset retirement assets which led to an increase in the fair value of property and equipment of $1.2 million and a corresponding increase in current liabilities and other long-term liabilities of $0.2 million and $1.0 million, respectively. The decrease in depreciation expense due to the change in fair value of property and equipment was immaterial for the quarter ended December 31, 2013.
[3] | During the three months ended March 31, 2014, there were no changes to the fair value of the identifiable intangible assets acquired. However, the Company revised the estimated useful life of Order backlog from 1.5 years to 1 year, which would have increased the amortization expense for the three months ended December 31, 2013 by $0.8 million to a total of $4.6 million amortization expense upon retrospective adjustment for such change in estimate.
[4] | The Company obtained new information regarding accruals for litigation and statutory tax assessment as of the acquisition date which led to an increase in the fair value of current liabilities of $0.7 million and a corresponding increase in goodwill.
[5] | The Company obtained new information regarding the existence of accrued liabilities as of the acquisition date which led to an increase in the fair value of accrued liabilities by $0.5 million with a corresponding increase in goodwill. The change in the fair value measurement for such accrued liabilities would have decreased operating expenses for three months ended December 31, 2013 by $0.5 million.

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