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Balance Sheet Accounts (Change in Deferred Support Revenue) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Jun. 30, 2014
Movement in Deferred Revenue [Roll Forward] |  |  |  |  |
Balance beginning of period |  |  |  |  | $ 97,677 us-gaap_DeferredRevenue
Balance end of period | 96,347 us-gaap_DeferredRevenue |  | 96,347 us-gaap_DeferredRevenue |  | 97,677 us-gaap_DeferredRevenue
Less: current portion | 73,206 us-gaap_DeferredRevenueCurrent |  | 73,206 us-gaap_DeferredRevenueCurrent |  | 74,735 us-gaap_DeferredRevenueCurrent
Non-current deferred revenue | 23,141 us-gaap_DeferredRevenueNoncurrent |  | 23,141 us-gaap_DeferredRevenueNoncurrent |  | 22,942 us-gaap_DeferredRevenueNoncurrent
Renewable Support Arrangements |  |  |  |  |
Movement in Deferred Revenue [Roll Forward] |  |  |  |  |
Balance beginning of period | 91,373 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 81,485 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 89,657 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 38,003 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember |
Assumed from acquisition | 0 extr_DeferredRevenueAssumedinAcquisition / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 0 extr_DeferredRevenueAssumedinAcquisition / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 0 extr_DeferredRevenueAssumedinAcquisition / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 35,879 extr_DeferredRevenueAssumedinAcquisition / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember |
New support arrangements | 27,198 us-gaap_DeferredRevenueAdditions / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 30,986 us-gaap_DeferredRevenueAdditions / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 91,254 us-gaap_DeferredRevenueAdditions / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 77,475 us-gaap_DeferredRevenueAdditions / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember |
Recognition of support revenue | (29,834)us-gaap_DeferredRevenueRevenueRecognized / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | (28,265)us-gaap_DeferredRevenueRevenueRecognized / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | (92,174)us-gaap_DeferredRevenueRevenueRecognized / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | (67,151)us-gaap_DeferredRevenueRevenueRecognized / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember |
Balance end of period | 88,737 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 84,206 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 88,737 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 84,206 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember |
Less: current portion | 65,596 us-gaap_DeferredRevenueCurrent / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 64,539 us-gaap_DeferredRevenueCurrent / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 65,596 us-gaap_DeferredRevenueCurrent / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | 64,539 us-gaap_DeferredRevenueCurrent / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember |
Non-current deferred revenue | $ 23,141 us-gaap_DeferredRevenueNoncurrent / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | $ 19,667 us-gaap_DeferredRevenueNoncurrent / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | $ 23,141 us-gaap_DeferredRevenueNoncurrent / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember | $ 19,667 us-gaap_DeferredRevenueNoncurrent / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareServiceSupportAndMaintenanceArrangementMember |

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