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Cover - USD ($)
 12 Months Ended
Nov. 30, 2023
Dec. 31, 2023
May 31, 2023
Nov. 30, 2022
Document Information [Line Items]        
Document Type 10-K      
Document Annual Report true      
Document Period End Date Nov. 30, 2023      
Current Fiscal Year End Date --11-30      
Document Transition Report false      
Entity File Number 001-09195      
Entity Registrant Name KB HOME      
Entity Incorporation, State or Country Code DE      
Entity Tax Identification Number 95-3666267      
Entity Address, Address Line One 10990 Wilshire Boulevard      
Entity Address, City or Town Los Angeles      
Entity Address, State or Province CA      
Entity Address, Postal Zip Code 90024      
City Area Code 310      
Local Phone Number 231-4000      
Entity Well-known Seasoned Issuer Yes      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Entity Interactive Data Current Yes      
Entity Filer Category Large Accelerated Filer      
Entity Small Business false      
Entity Emerging Growth Company false      
ICFR Auditor Attestation Flag true      
Document Financial Statement Error Correction [Flag] false      
Entity Shell Company false      
Entity Public Float     $ 3,783,365,796  
Grantor stock ownership trust (in shares) 6,705,247     6,705,247
Treasury stock (in shares) 18,703,704     10,015,507
Entity Common Stock Shares Outstanding   75,867,028    
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for the 2024 Annual Meeting of Stockholders (incorporated into Part III).
      
Entity Central Index Key 0000795266      
Amendment Flag false      
Document Fiscal Year Focus 2023      
Document Fiscal Period Focus FY      
Subsequent Event | Grantor Stock Ownership Trust        
Document Information [Line Items]        
Grantor stock ownership trust (in shares)   6,705,247    
Common Stock        
Document Information [Line Items]        
Title of 12(b) Security Common Stock (par value $1.00 per share)      
Trading Symbol KBH      
Security Exchange Name NYSE      
Rights        
Document Information [Line Items]        
Title of 12(b) Security Rights to Purchase Series A Participating Cumulative Preferred Stock      
No Trading Symbol Flag true      
Security Exchange Name NYSE