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Share Based Payments Summary of Nonvested Options and Changes (Detail) (USD $)
 12 Months Ended
Feb. 28, 2015
Options  
Nonvested, beginning of period (in shares) 3,325,481emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingNumber
Granted (in shares) 571,219us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Vested (in shares) 689,617us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
Forfeited (in shares) 40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Nonvested, end of period (in shares) 3,167,083emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingNumber
Weighted Average Grant Date Fair Value  
Nonvested, beginning of period (in dollars per share) $ 0.98emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsWeightedAverageGrantDateFairValue
Granted (in dollars per share) $ 1.64emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsGrantedInPeriodWeightedAverageGrantDateFairValue
Vested (in dollars per share) $ 1.07emms_ShareBasedCompensationShareBasedPaymentAwardsOptionVestedInPeriodWeightedAverageGrantDateFairValue
Forfeited (in dollars per share) $ 0.57emms_ShareBasedCompensationShareBasedPaymentAwardsOptionForfeitedInPeriodWeightedAverageGrantDateFairValue
Nonvested, end of period (in dollars per share) $ 1.08emms_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsWeightedAverageGrantDateFairValue