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Balance Sheet Accounts (Narratives) (Details) (USD $) | 9 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Oct. 31, 2013 | Mar. 31, 2015 | 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 | 59,000,000 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 |  |  |  | 19,000,000 us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 30,000,000 us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
Remaining borrowing capacity | 8,600,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  | 8,600,000 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 |  |  |
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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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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