Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Feb. 28, 2014
Deferred tax assets:
Net operating loss carryforwards	$ 32,627	$ 27,963
Intangible assets	30,299emms_DeferredTaxAssetsIntangibleAssets	12,127emms_DeferredTaxAssetsIntangibleAssets
Compensation relating to stock options	1,438	2,199
Interest rate exchange agreement	0	38
Deferred revenue	1,260us-gaap_DeferredTaxAssetsDeferredIncome	1,639us-gaap_DeferredTaxAssetsDeferredIncome
Accrued rent	2,071	1,897
Tax credits	1,987emms_DeferredTaxAssetsTaxCredits	1,927emms_DeferredTaxAssetsTaxCredits
Investments in subsidiairies	2,951	352
Other	1,875us-gaap_DeferredTaxAssetsOther	2,181us-gaap_DeferredTaxAssetsOther
Valuation allowance	(62,984)	(970)
Total deferred tax assets	11,524us-gaap_DeferredTaxAssetsGross	49,353us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities
Indefinite-lived intangible assets	(41,576)	(40,549)
Property and equipment	(751)	(569)
Cancellation of debt income	(10,772)	(13,136)
Other	(39)us-gaap_DeferredTaxLiabilitiesOther	0us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(53,138)emms_DeferredTaxLiabilitiesGross	(54,254)emms_DeferredTaxLiabilitiesGross
Net deferred tax liabilities	$ (41,614)us-gaap_DeferredTaxLiabilities	$ (4,901)us-gaap_DeferredTaxLiabilities

Deferred Tax Assets, Intangible Assets

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Deferred Tax Liabilities, Cancellation of Debt Income

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Deferred Tax Liabilities, Intangible Asset Basis Difference

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the entity's investment in its wholly-owned subsidiaries.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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