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Business combinations (Estimated Purchase Price) (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 | Jun. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 70,877,000 us-gaap_Goodwill |  |  |  |  |  |  | $ 70,877,000 us-gaap_Goodwill
Total purchase price consideration, net of cash acquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 180,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |  |  |
Enterasys Networks, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash |  |  | 7,397,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 4,969,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | 7,397,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Receivables |  |  | 23,271,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 25,699,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | 23,271,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Inventory |  |  | 33,662,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 33,662,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | 33,662,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Other current assets |  |  | 7,374,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 8,888,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | 7,374,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Property and equipment |  |  | 21,293,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 23,122,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | 21,293,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Identifiable intangible assets |  |  | 108,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 108,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | 108,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
In-process research and development |  |  | 3,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 3,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | 3,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Deferred tax assets |  |  | 9,000 extr_BusinessCombinationBusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsDeferredTaxAssets / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 9,000 extr_BusinessCombinationBusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsDeferredTaxAssets / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | 9,000 extr_BusinessCombinationBusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsDeferredTaxAssets / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Other assets |  |  | 7,343,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 7,343,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | 7,343,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Goodwill |  |  | 70,877,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 57,922,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | 70,877,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Current liabilities |  |  | (81,535,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | (75,394,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | (81,535,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Other long-term liabilities |  |  | (14,194,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | (13,151,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | (14,194,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Total purchase price allocation |  |  | 187,397,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | 184,969,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  | 187,397,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Less: Cash acquired from acquisition |  |  | (7,397,000)us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | (4,969,000)us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |  |  |
Total purchase price consideration, net of cash acquired |  |  | 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, Cash |  |  |  |  |  | 2,428,000 extr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCashandEquivalents / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | [1] |
Change during the period, Receivables |  |  |  |  |  | (2,428,000)extr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentReceivables / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | [1] |
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] |
Change during period, Identifiable intangible assets |  |  |  |  |  | 0 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | [4] |
Change during the period, Goodwill |  |  |  |  |  | 12,955,000 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Change during the period, Current Liabilities |  |  |  |  |  | (6,141,000)extr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | [3],[5],[6] |
Change during the period, Other long-term liabilities |  |  |  |  |  | (1,043,000)extr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilities / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | [3] |
Change during the period, Total purchase price allocation |  |  |  |  |  | 2,428,000 extr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
Change during the period, Cash acquired from acquisition |  |  |  |  |  | (2,428,000)extr_CashAcquiredfromAcquisitionInitialAccountingIncompleteAdjustment / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | [1] |
Goodwill, increase (decrease) |  |  |  |  |  | 2,400,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member |  |
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.
[4] | During the nine months ended September 30, 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.
[5] | The Company obtained new information regarding the existence of accrued liabilities as of the acquisition date which led to a net increase in the fair value of accrued liabilities by $0.5 million with a corresponding increase in goodwill.
[6] | 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 $5.4 million and a corresponding increase in goodwill.

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- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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