Cover	9 Months Ended
	Aug. 31, 2025 shares
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Aug. 31, 2025
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
Title of 12(b) Security	Common Stock (par value $1.00 per share)
Trading Symbol	KBH
Security Exchange Name	NYSE
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	64,764,685
Entity Central Index Key	0000795266
Amendment Flag	false
Current Fiscal Year End Date	--11-30
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q3