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Employee Benefit Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2013
Mar. 02, 2015
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grants 3.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant        
Multi-employer plan contribution expense $ 0.3us-gaap_MultiemployerPlanPeriodContributions $ 0.1us-gaap_MultiemployerPlanPeriodContributions $ 0.1us-gaap_MultiemployerPlanPeriodContributions    
Two Thousand Twelve Equity Compensation Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares that may be granted     2.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= emms_TwoThousandTwelveEquityCompensationPlanMember
   
Number of shares available for grants 1.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= emms_TwoThousandTwelveEquityCompensationPlanMember
       
Two Thousand Twelve Equity Compensation Plan | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration of Stock option under the plan 10 years        
401 (k) Retirement Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Minimum age for retirement saving plan 18 years        
Minimum days of service required to participate in retirement savings plan 30 days        
Maximum percentage of eligible compensation by employee 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
/ us-gaap_PlanNameAxis
= emms_FourZeroOneKRetirementPlanMember
       
Maximum employer match on employee's contribution 33.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
/ us-gaap_PlanNameAxis
= emms_FourZeroOneKRetirementPlanMember
       
Employer matching contribution on employee's salary percentage 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_PlanNameAxis
= emms_FourZeroOneKRetirementPlanMember
       
Employer discretionary contribution $ 1.1us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
/ us-gaap_PlanNameAxis
= emms_FourZeroOneKRetirementPlanMember
$ 0.9us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
/ us-gaap_PlanNameAxis
= emms_FourZeroOneKRetirementPlanMember
$ 0.9us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
/ us-gaap_PlanNameAxis
= emms_FourZeroOneKRetirementPlanMember
   
Subsequent Event [Member] | Two Thousand Twelve Equity Compensation Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grants         0.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= emms_TwoThousandTwelveEquityCompensationPlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period       1.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= emms_TwoThousandTwelveEquityCompensationPlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember