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Business combinations (Narrative) (Details) (USD $) | 9 Months Ended | 0 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Oct. 31, 2013 | Sep. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price paid in acquisition | $ 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 180,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |  |
Enterasys Networks, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price paid in acquisition |  |  | 180,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 180,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 180,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Change during the period, Receivables |  |  |  |  |  | 2,428,000 extr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentReceivables / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | [1]
Goodwill, increase (decrease) |  |  |  |  |  | 2,400,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |
Change during the period, other current assets |  |  |  |  |  | 1,514,000 extr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherCurrentAssets / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | [2]
Change during the period, Property and equipment |  |  |  |  |  | (1,829,000)us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | [3]
Increase (decrease) in current liabilities for litigation and statutory tax assessments |  |  |  |  |  | 5,400,000 extr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentContingentLiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |
Increase (decrease) for accrued liabilities |  |  |  |  |  | 500,000 extr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedLiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |
Enterasys Networks, Inc. | Order backlog |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite-lived intangible asset useful lives |  |  | 1 year |  |  | 1 year 6 months |
Enterasys Networks, Inc. | Goodwill |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change during the period, Property and equipment |  |  |  |  |  | 3,000,000 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment / us-gaap_BalanceSheetLocationAxis = us-gaap_GoodwillMember / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |
Enterasys Networks, Inc. | Property, Plant and Equipment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change during the period, Property and equipment |  |  |  |  |  | 1,200,000 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment / us-gaap_BalanceSheetLocationAxis = us-gaap_PropertyPlantAndEquipmentMember / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |
Enterasys Networks, Inc. | Other Current Liabilities |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change during the period, Property and equipment |  |  |  |  |  | 200,000 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |
Enterasys Networks, Inc. | Other Noncurrent Liabilities |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change during the period, Property and equipment |  |  |  |  |  | $ 1,000,000 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |
[1] | The Company finalized the working capital adjustment as of September 30, 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 obtained new information regarding the existence of prepaid assets as of the acquisition date which led to a decrease in the fair value of current assets of $1.5 million, and a corresponding increase in goodwill. The change in the amortization of prepaid assets due to the change in fair value of current assets was immaterial.
[3] | 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.

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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to property, plant, and equipment acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1500-128463 + Details
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