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Income Taxes (Details) (USD $)
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]        
Provision for income taxes $ 1,330,000us-gaap_IncomeTaxExpenseBenefit $ 925,000us-gaap_IncomeTaxExpenseBenefit $ 2,338,000us-gaap_IncomeTaxExpenseBenefit $ 1,352,000us-gaap_IncomeTaxExpenseBenefit
Tax amortization deduction for capitalized goodwill 1,100,000extr_EffectiveIncomeTaxRateReconciliationDeductionGoodwillAmount   2,200,000extr_EffectiveIncomeTaxRateReconciliationDeductionGoodwillAmount  
Deferred tax liability, goodwill 1,900,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill   1,900,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill  
Unrecognized tax benefits 11,500,000us-gaap_UnrecognizedTaxBenefits   11,500,000us-gaap_UnrecognizedTaxBenefits  
Accrued penalties and interest for unrecognized income tax benefits   $ 42,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   $ 42,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Enterasys Networks, Inc.        
Operating Loss Carryforwards [Line Items]        
Amortization period for tax purposes     15 years