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Common Stock (Details)
 12 Months Ended
Feb. 28, 2015
vote
Class A Common Stock  
Class of Stock [Line Items]  
Number of votes per share of common stock 1emms_CommonStockNumberofVotes
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B Common Stock  
Class of Stock [Line Items]  
Number of votes per share of common stock 10emms_CommonStockNumberofVotes
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Class C Common Stock  
Class of Stock [Line Items]  
Number of votes per share of common stock 0emms_CommonStockNumberofVotes
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember