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Balance Sheet Accounts (Narratives) (Details) (USD $) | 6 Months Ended | 0 Months Ended | 1 Months Ended | 2 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Oct. 31, 2013 | Oct. 29, 2014 | Dec. 31, 2014 | Sep. 30, 2014
Balance Sheet Accounts [Line Items] |  |  |  |  |  |
Other than temporary impairment loss |  | $ 148,000 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  |  |
Borrowings under Revolving Facility | 24,000,000 us-gaap_ProceedsFromLongTermLinesOfCredit | 35,000,000 us-gaap_ProceedsFromLongTermLinesOfCredit |  |  |  |
Letters for credit outstanding | 1,000,000 us-gaap_LettersOfCreditOutstandingAmount |  |  |  | 1,000,000 us-gaap_LettersOfCreditOutstandingAmount |
Standard hardware warranty period | 12 months |  |  |  |  |
Standard software warranty period | 90 days |  |  |  |  |
Limited lifetime hardware warranty maximum period after end of sale of product | 5 years |  |  |  |  |
Maximum investment in one obligor or maker (percent) | 10.00%extr_ConcentrationRiskInvestmentPolicyInOneObligorOrMakerPercentageMaximum |  |  |  |  |
Revolving Facility |  |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |  |
Term of agreement |  |  | 5 years |  |  |
Borrowing capacity |  |  | 60,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Borrowings under Revolving Facility |  |  |  |  |  | 24,000,000 us-gaap_ProceedsFromLongTermLinesOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Repayments under Revolving Facility |  |  |  | 24,000,000 us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 6,000,000 us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
Remaining borrowing capacity | 17,400,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  | 17,400,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
Term Loan |  |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |  |
Term of agreement |  |  | 5 years |  |  |
Borrowing capacity |  |  | 65,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = extr_TermLoanFacilityMember |  |  |
Enterasys Networks, Inc. | Revolving Facility |  |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |  |
Borrowings under Revolving Facility |  |  | $ 35,000,000 us-gaap_ProceedsFromLongTermLinesOfCredit / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Minimum |  |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |  |
Extended warranty period | 1 year |  |  |  |  |
Minimum | Net Revenue | Customer Concentration Risk |  |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |  |
Concentration risk | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Maximum |  |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |  |
Extended warranty period | 5 years |  |  |  |  |
Cash equivalents | Maximum |  |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |  |
Maturity period for investments | 3 months |  |  |  |  |
Short-term Investments | Minimum |  |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |  |
Maturity period for investments | 3 months |  |  |  |  |
Short-term Investments | Maximum |  |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |  |
Maturity period for investments | 1 year |  |  |  |  |
Marketable Securities | Minimum |  |  |  |  |  |
Balance Sheet Accounts [Line Items] |  |  |  |  |  |
Maturity period for investments | 1 year |  |  |  |  |

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