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Contingencies (Details) (Retirees Vs Verizon and Company Employee Benefits Committee and Pension Plans)
0 Months Ended
Nov. 04, 2010
claim
Nov. 25, 2009
plaintiff
Retirees Vs Verizon and Company Employee Benefits Committee and Pension Plans
   
Loss Contingencies [Line Items]    
Number of plaintiffs   3us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationCaseAxis
= dxm_RetireesVsVerizonandCompanyEmployeeBenefitsCommitteeandPensionPlansMember
Number of claims for which motion was filed for dismissal 1dxm_LossContingencyNumberofClaimsforwhichMotionofDismissalwasFiled
/ us-gaap_LitigationCaseAxis
= dxm_RetireesVsVerizonandCompanyEmployeeBenefitsCommitteeandPensionPlansMember
 
Number of remaining procedural ERISA claims 2us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationCaseAxis
= dxm_RetireesVsVerizonandCompanyEmployeeBenefitsCommitteeandPensionPlansMember