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Senior Leverage Ratio and Total Leverage Ratio Requirements and Actual Amounts (Detail)
Feb. 28, 2015
Covenant Requirement | Maximum  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 6.0emms_TotalLeverageRatio
/ us-gaap_DebtInstrumentAxis
= emms_CovenantRequirementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Covenant Requirement | Minimum  
Line of Credit Facility [Line Items]  
Minimum Fixed Charge Coverage Ratio 2.00emms_FixedChargeCoverageRatio
/ us-gaap_DebtInstrumentAxis
= emms_CovenantRequirementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Actual | Maximum  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 5.40emms_TotalLeverageRatio
/ us-gaap_DebtInstrumentAxis
= emms_ActualMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Actual | Minimum  
Line of Credit Facility [Line Items]  
Minimum Fixed Charge Coverage Ratio 3.08emms_FixedChargeCoverageRatio
/ us-gaap_DebtInstrumentAxis
= emms_ActualMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember