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Subsequent Events (Details) (Subsequent Event, USD $) In Millions, unless otherwise specified | 0 Months Ended | 1 Months Ended
--- | --- | ---
Oct. 15, 2012 Lease Agreement renewal_option sqft | Oct. 31, 2012 Share Repurchase Program - October 2012 Maximum
Subsequent Event [Line Items] |  |
Authorized amount for share repurchase program |  | $ 75
Square feet of leased space | 56,218 |
Initial term of lease (in years, months, and days) | 7 years 9 months 18 days |
Annual rent in the initial year of lease agreement | 1.2 |
Annual rent in the final year of lease agreement | $ 1.4 |
Number of renewal options | 2 |
Term of renewal options (years) | 5 years |

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- Definition Lease Agreement, Annual Rent Payments in Initial Year + References No definition available. + Details
Name: | extr_LeaseAgreementAnnualRentPaymentsInInitialYear
Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating Leases, Future Minimum Payments, Balloon Payment Amount + References No definition available. + Details
Name: | extr_OperatingLeasesFutureMinimumPaymentsBalloonPaymentAmount
Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating Leases, Renewal Options, Number + References No definition available. + Details
Name: | extr_OperatingLeasesRenewalOptionsNumber
Namespace Prefix: | extr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Operating Leases, Renewal Option, Term + References No definition available. + Details
Name: | extr_OperatingLeasesRenewalOptionTerm
Namespace Prefix: | extr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating Leases, Term + References No definition available. + Details
Name: | extr_OperatingLeasesTerm
Namespace Prefix: | extr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration