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Balance Sheet Accounts (Schedule of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Line of Credit Facility [Line Items]    
Current portion of long-term debt $ 8,125us-gaap_LongTermDebtCurrent $ 29,688us-gaap_LongTermDebtCurrent
Long-term debt, less current portion 81,000us-gaap_LongTermDebtNoncurrent 91,875us-gaap_LongTermDebtNoncurrent
Total debt 89,125us-gaap_LongTermDebt 121,563us-gaap_LongTermDebt
Term Loan    
Line of Credit Facility [Line Items]    
Current portion of long-term debt 8,125us-gaap_LongTermDebtCurrent
/ us-gaap_CreditFacilityAxis
= extr_TermLoanFacilityMember		 5,688us-gaap_LongTermDebtCurrent
/ us-gaap_CreditFacilityAxis
= extr_TermLoanFacilityMember
Long-term debt, less current portion 52,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= extr_TermLoanFacilityMember		 56,875us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= extr_TermLoanFacilityMember
Revolving Facility    
Line of Credit Facility [Line Items]    
Current portion of long-term debt 0us-gaap_LongTermDebtCurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		 24,000us-gaap_LongTermDebtCurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Long-term debt, less current portion $ 29,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		 $ 35,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember