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Balance Sheet Accounts (Schedule of Deferred Distributors Revenue) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Deferred Revenue Arrangement [Line Items]    
Deferred distributors revenue $ 98,293us-gaap_DeferredRevenue $ 97,677us-gaap_DeferredRevenue
Total deferred distributors revenue, net of cost of sales to distributors 31,172extr_DeferredRevenueNetOfCostOfSalesToDistributors 31,992extr_DeferredRevenueNetOfCostOfSalesToDistributors
Distributors    
Deferred Revenue Arrangement [Line Items]    
Deferred distributors revenue 40,901us-gaap_DeferredRevenue
/ us-gaap_DeferredRevenueArrangementTypeAxis
= extr_DistributorsMember
40,715us-gaap_DeferredRevenue
/ us-gaap_DeferredRevenueArrangementTypeAxis
= extr_DistributorsMember
Deferred cost of sales to distributors (9,729)extr_DeferredCostOfSales
/ us-gaap_DeferredRevenueArrangementTypeAxis
= extr_DistributorsMember
(8,723)extr_DeferredCostOfSales
/ us-gaap_DeferredRevenueArrangementTypeAxis
= extr_DistributorsMember
Total deferred distributors revenue, net of cost of sales to distributors $ 31,172extr_DeferredRevenueNetOfCostOfSalesToDistributors
/ us-gaap_DeferredRevenueArrangementTypeAxis
= extr_DistributorsMember
$ 31,992extr_DeferredRevenueNetOfCostOfSalesToDistributors
/ us-gaap_DeferredRevenueArrangementTypeAxis
= extr_DistributorsMember