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Cover
Jan. 21, 2021
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jan. 21, 2021
Entity Registrant Name KB HOME
Entity Incorporation, State or Country Code DE
Entity File Number 1-9195
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Document Information [Line Items]  
Entity Central Index Key 0000795266
Amendment Flag false
Entity Emerging Growth Company false
Common Stock [Member]  
Document Information [Line Items]  
Security Exchange Name NYSE
Trading Symbol KBH
Title of 12(b) Security Common Stock (par value $1.00 per share)
Rights [Member]  
Document Information [Line Items]  
Security Exchange Name NYSE
Trading Symbol KBH
Title of 12(b) Security Rights to Purchase Series A Participating Cumulative Preferred Stock