Cover - shares	6 Months Ended
	May 31, 2023	Nov. 30, 2022
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	May 31, 2023
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding	80,609,911
Grantor Stock Ownership Trust (in shares)	6,705,247	6,705,247
Entity Central Index Key	0000795266
Amendment Flag	false
Current Fiscal Year End Date	--11-30
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
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
Security Exchange Name	NYSE
No Trading Symbol Flag	true