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Summary of Significant Accounting Policies (Allowance for Sales Returns) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jul. 03, 2012
Allowance for Sales Returns [Roll Forward] |  |  |
Balance at beginning of period | $ 777 | $ 1,262 | $ 645
Charges to costs and expenses | 3,063 | 130 | 1,013
(Deductions) | (1,140) | (615) | (396)
Balance at end of period | $ 2,700 | $ 777 | $ 1,262

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- Details
Name: | extr_AllowanceforSalesReturnsRollForward
Namespace Prefix: | extr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Financing Receivable, Allowance for Sales Returns + References No definition available. + Details
Name: | extr_FinancingReceivableAllowanceforSalesReturns
Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financing Receivable, Allowance for Sales Returns, Write-downs + References No definition available. + Details
Name: | extr_FinancingReceivableAllowanceforSalesReturnsWritedowns
Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Provision for Sales Returns Losses + References No definition available. + Details
Name: | extr_ProvisionforSalesReturnsLosses
Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration