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Document And Entity Information (USD $)
 12 Months Ended
Feb. 28, 2014
Mar. 31, 2014
Aug. 31, 2013
Document And Entity Information [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Document Period End Date Feb. 28, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Entity Registrant Name CARMAX INC    
Entity Central Index Key 0001170010    
Entity Public Float     $ 10,621,543,601
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Current Fiscal Year End Date --02-28    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   220,805,697  
Amendment Description We are filing this Amendment No. 1 on Form 10-K/A ("Amendment") to amend our Annual Report on Form 10-K for the fiscal year ended February 28, 2014, as filed with the Securities and Exchange Commission ("SEC") on April 25, 2014 ("Form 10-K"). The sole purpose of this Amendment is to correct inadvertent errors in the eXtensible Business Reporting Language ("XBRL") information filed with the original Form 10-K. No changes have been made in this Amendment to modify or update the other disclosures presented in the Form 10-K. This Amendment does not reflect events occurring after the filing of the Form 10-K or modify or update any disclosures in the Form 10-K that may be affected by such events. This Amendment should be read in conjunction with the Form 10-K and our other filings with the SEC.