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Balance Sheet Accounts (Schedule of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Line of Credit Facility [Line Items]    
Current portion of long-term debt $ 9,750us-gaap_LongTermDebtCurrent $ 29,688us-gaap_LongTermDebtCurrent
Long-term debt, less current portion 58,750us-gaap_LongTermDebtNoncurrent 91,875us-gaap_LongTermDebtNoncurrent
Total debt 68,500us-gaap_LongTermDebt 121,563us-gaap_LongTermDebt
Term Loan    
Line of Credit Facility [Line Items]    
Current portion of long-term debt   5,688us-gaap_LongTermDebtCurrent
/ us-gaap_CreditFacilityAxis
= extr_TermLoanFacilityMember
Long-term debt, less current portion 48,750us-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 $ 10,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		 $ 35,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember