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Income Taxes (Details) (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Operating Loss Carryforwards [Line Items]        
Provision for income taxes $ 1,121,000us-gaap_IncomeTaxExpenseBenefit $ 910,000us-gaap_IncomeTaxExpenseBenefit $ 3,458,000us-gaap_IncomeTaxExpenseBenefit $ 2,262,000us-gaap_IncomeTaxExpenseBenefit
Tax amortization deduction for capitalized goodwill 1,100,000extr_EffectiveIncomeTaxRateReconciliationDeductionGoodwillAmount   3,400,000extr_EffectiveIncomeTaxRateReconciliationDeductionGoodwillAmount  
Deferred tax liability, goodwill 2,400,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill   2,400,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill  
Unrecognized tax benefits 11,300,000us-gaap_UnrecognizedTaxBenefits   11,300,000us-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