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Balance Sheet Accounts (Schedule of Debt) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Jun. 30, 2014
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Line of Credit Facility [Line Items] |  |
Current portion of long-term debt | $ 9,750 us-gaap_LongTermDebtCurrent | $ 29,688 us-gaap_LongTermDebtCurrent
Long-term debt, less current portion | 58,750 us-gaap_LongTermDebtNoncurrent | 91,875 us-gaap_LongTermDebtNoncurrent
Total debt | 68,500 us-gaap_LongTermDebt | 121,563 us-gaap_LongTermDebt
Term Loan |  |
Line of Credit Facility [Line Items] |  |
Current portion of long-term debt |  | 5,688 us-gaap_LongTermDebtCurrent / us-gaap_CreditFacilityAxis = extr_TermLoanFacilityMember
Long-term debt, less current portion | 48,750 us-gaap_LongTermDebtNoncurrent / us-gaap_CreditFacilityAxis = extr_TermLoanFacilityMember | 56,875 us-gaap_LongTermDebtNoncurrent / us-gaap_CreditFacilityAxis = extr_TermLoanFacilityMember
Revolving Facility |  |
Line of Credit Facility [Line Items] |  |
Current portion of long-term debt | 0 us-gaap_LongTermDebtCurrent / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 24,000 us-gaap_LongTermDebtCurrent / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Long-term debt, less current portion | $ 10,000 us-gaap_LongTermDebtNoncurrent / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | $ 35,000 us-gaap_LongTermDebtNoncurrent / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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