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Segment Reporting (Details) - USD ($)
$ in Thousands
 12 Months Ended
Feb. 28, 2023
Feb. 28, 2022
Feb. 28, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
NET SALES AND OPERATING REVENUES $ 29,684,873 $ 31,900,412 $ 18,950,149
Depreciation and amortization 265,224 273,188 242,156
Gross Profit 2,800,203 3,287,542 2,379,125
CARMAX AUTO FINANCE INCOME  663,404 801,507 562,810
Selling, General and Administrative Expense (2,487,357) (2,325,220) (1,704,419)
Depreciation, Depletion and Amortization, Nonproduction (228,449) (211,956) (194,356)
Interest expense (120,398) (94,095) (86,178)
Nonoperating Income (Expense) 9,401 34,568 8,275
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest 636,804 1,492,346 $ 965,257
TOTAL COST OF SALES      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Depreciation and amortization 15,762 8,332  
Intersegment Eliminations      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
NET SALES AND OPERATING REVENUES (28,038) (22,169)  
Gross Profit (5,333) (5,207)  
CarMax Sales Operations      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
NET SALES AND OPERATING REVENUES 29,551,617 31,798,596  
Gross Profit 2,704,398 3,207,946  
CarMax Sales Operations | TOTAL COST OF SALES      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Depreciation and amortization 1,499 840  
CarMax Sales Operations | Operating Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
NET SALES AND OPERATING REVENUES 29,551,617 31,798,596  
Other Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
NET SALES AND OPERATING REVENUES 133,256 101,816  
Gross Profit 101,138 84,803  
Other Segments | TOTAL COST OF SALES      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Depreciation and amortization 14,263 7,492  
Other Segments | Operating Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
NET SALES AND OPERATING REVENUES 161,294 123,985  
Other Segments | Intersegment Eliminations      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
NET SALES AND OPERATING REVENUES $ 28,038 $ 22,169