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Long-term Debt - Schedule of Maximum Leverage Ratio (Detail) (Two Thousand Fourteen Credit Agreement)
Nov. 30, 2014
Covenant Requirement  
Line of Credit Facility  
Maximum Total Leverage Ratio 5.25emms_TotalLeverageRatio
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
/ us-gaap_StatementScenarioAxis
= emms_CovenantRequirementMember
Minimum Interest Coverage Ratio 2.0emms_InterestCoverageRatio
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
/ us-gaap_StatementScenarioAxis
= emms_CovenantRequirementMember
Actual Results  
Line of Credit Facility  
Maximum Total Leverage Ratio 4.16emms_TotalLeverageRatio
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Minimum Interest Coverage Ratio 2.47emms_InterestCoverageRatio
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember