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Balance Sheet Accounts (Schedule of Service Inventory) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Jun. 30, 2012
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Service Inventory | $ 12,992 | $ 13,109
Less: Excess and Obsolete Inventory | 4,947 | 5,074
Service Inventory, Net | $ 8,045 | $ 8,035

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- Definition Inventory Valuation Reserves, Service Materials and Supplies + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Inventory, Service Materials and Supplies, Gross + References No definition available. + Details
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Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other Inventory, Service Materials and Supplies, Net + References No definition available. + Details
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Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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