Document and Entity Information	6 Months Ended
	May 31, 2018 shares
Document and Entity Information [Abstract]
Entity Registrant Name	KB HOME
Trading Symbol	KBH
Entity Central Index Key	0000795266
Document Type	10-Q
Document Period End Date	May 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--11-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock Shares Outstanding	87,688,801