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Share Based Payments - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2014
Nov. 30, 2013
Apr. 02, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Proceeds from Stock Options Exercised     $ 400,000us-gaap_ProceedsFromStockOptionsExercised $ 100,000us-gaap_ProceedsFromStockOptionsExercised  
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options     100,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 0.00us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions  
Stock options granted, term     10 years    
Stock options vesting period     3 years    
Annual percentage over three years     33.33%emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodAnnualPercentage    
Stock options weighted average grant date fair value     $ 1.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 1.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Shares available for future grants 3,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant   3,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Restricted stock awards requisite service period     3 years    
Grant date fair value of shares vested     3,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue 1,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue  
Compensation expenses 597,000us-gaap_AllocatedShareBasedCompensationExpense 471,000us-gaap_AllocatedShareBasedCompensationExpense 2,128,000us-gaap_AllocatedShareBasedCompensationExpense 3,553,000us-gaap_AllocatedShareBasedCompensationExpense  
Unrecognized compensation cost 2,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized   2,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Compensation cost of weighted average period     1 year 7 months 10 days    
2012 Retention Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock awards requisite service period         2 years
Preferred stock contributed by company         400,000emms_PreferredStockContribution
/ us-gaap_PlanNameAxis
= emms_RetentionPlanMember
Compensation expenses     $ 400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= emms_RetentionPlanMember
$ 1,400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= emms_RetentionPlanMember
 
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Risk-Free Interest Rate:     1.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Vesting dates of outstanding options     2015-02    
Expiration dates of options     2015-03    
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Risk-Free Interest Rate:     1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Vesting dates of outstanding options     2018-03    
Expiration dates of options     2024-09