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Commitments and Contingencies (Details)
9 Months Ended 9 Months Ended 0 Months Ended
Mar. 31, 2015
USD ($)
Mar. 31, 2015
Foreign
USD ($)
Mar. 31, 2014
Foreign
USD ($)
Mar. 31, 2014
Foreign
BRL
Mar. 31, 2015
Minimum
Foreign
USD ($)
Mar. 31, 2015
Maximum
Foreign
USD ($)
Feb. 03, 2014
Commonwealth of Kentucky
Pending Litigation
defendant
Loss Contingencies [Line Items]              
Non-cancelable purchase commitments $ 100,700,000us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted            
Number of co-defendants             2extr_LossContingencyNumberofCodefendants
/ us-gaap_LitigationCaseAxis
= extr_CommonwealthofKentuckyMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
Value of tax credits disallowed     1,500,000extr_IncomeTaxExaminationDisallowedTaxCredits
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
3,443,914extr_IncomeTaxExaminationDisallowedTaxCredits
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
     
Estimated interest in penalties   9,000,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
         
Potential total tax liability   $ 4,300,000us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
    $ 0us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 9,000,000us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember