Summary of Significant Accounting Policies Calculation of Basic and Diluted Net Income Per Share from Continuing Operations (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Basic net (loss) income per common share:
Net (loss) income available to common shareholders from continuing operations	$ 2,823	$ 4,273	$ 6,539	$ 10,645
Impact of equity awards
Impact of conversion of preferred stock into common stock	0		0	(325)
Diluted net (loss) income per common share:
Net income available to common shareholders from continuing operations	$ 2,823	$ 4,273	$ 6,539	$ 10,320
Basic shares:
Basic weighted average common shares outstanding (in shares)	42,702	40,477	42,451	40,343
Impact of equity awards (in shares)	2,408	3,469	2,738	3,040
Impact of conversion of preferred stock into common stock (in shares)	2,266	2,266	2,266	2,274
Diluted shares:
Diluted weighted average common shares outstanding (in shares)	47,376	46,212	47,455	45,657
Basic net income per common share:
Net income available to common shareholders from continuing operations, per basic shares (in dollars per share)	$ 0.07	$ 0.11	$ 0.15	$ 0.26
Impact of equity awards (in dollars per share)
Impact of conversion of preferred stock into common stock (in dollars per share)
Diluted net income per common share:
Net income available to common shareholders from continuing operations, per dilutive shares (in dollars per share)	$ 0.06	$ 0.09	$ 0.14	$ 0.23

Summary of Significant Accounting Policies Calculation of Basic and Diluted Net Income Per Share from Continuing Operations (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified

3 Months Ended

9 Months Ended

Nov. 30, 2014

Nov. 30, 2013

Nov. 30, 2014

Nov. 30, 2013

Basic net (loss) income per common share:

Net (loss) income available to common shareholders from continuing operations

$ 2,823emms_NetIncomeLossAvailableToCommonStockholdersBasicContinuingOperations

$ 4,273emms_NetIncomeLossAvailableToCommonStockholdersBasicContinuingOperations

$ 6,539emms_NetIncomeLossAvailableToCommonStockholdersBasicContinuingOperations

$ 10,645emms_NetIncomeLossAvailableToCommonStockholdersBasicContinuingOperations

Impact of equity awards

Impact of conversion of preferred stock into common stock

0us-gaap_AmountOfDilutiveSecuritiesESOPConvertiblePreferredStock

(325)us-gaap_AmountOfDilutiveSecuritiesESOPConvertiblePreferredStock

Diluted net (loss) income per common share:

Net income available to common shareholders from continuing operations

$ 2,823emms_NetIncomeLossAvailableToCommonStockholdersDilutedContinuingOperations

$ 4,273emms_NetIncomeLossAvailableToCommonStockholdersDilutedContinuingOperations

$ 6,539emms_NetIncomeLossAvailableToCommonStockholdersDilutedContinuingOperations

$ 10,320emms_NetIncomeLossAvailableToCommonStockholdersDilutedContinuingOperations

Basic shares:

Basic weighted average common shares outstanding (in shares)

42,702us-gaap_WeightedAverageNumberOfSharesOutstandingBasic

40,477us-gaap_WeightedAverageNumberOfSharesOutstandingBasic

42,451us-gaap_WeightedAverageNumberOfSharesOutstandingBasic

40,343us-gaap_WeightedAverageNumberOfSharesOutstandingBasic

Impact of equity awards (in shares)

2,408us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

3,469us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

2,738us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

3,040us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

Impact of conversion of preferred stock into common stock (in shares)

2,266us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock

2,274us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock

Diluted shares:

Diluted weighted average common shares outstanding (in shares)

47,376us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

46,212us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

47,455us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

45,657us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

Basic net income per common share:

Net income available to common shareholders from continuing operations, per basic shares (in dollars per share)

$ 0.07us-gaap_IncomeLossFromContinuingOperationsPerBasicShare

$ 0.11us-gaap_IncomeLossFromContinuingOperationsPerBasicShare

$ 0.15us-gaap_IncomeLossFromContinuingOperationsPerBasicShare

$ 0.26us-gaap_IncomeLossFromContinuingOperationsPerBasicShare

Impact of equity awards (in dollars per share)

Impact of conversion of preferred stock into common stock (in dollars per share)

Diluted net income per common share:

Net income available to common shareholders from continuing operations, per dilutive shares (in dollars per share)

$ 0.06us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare

$ 0.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare

$ 0.14us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare

$ 0.23us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare

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