Document And Entity Information - shares	9 Months Ended
	May 31, 2018	Jul. 09, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	May 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Entity Registrant Name	EACO CORP
Entity Central Index Key	0000784539
Current Fiscal Year End Date	--08-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	EACO
Entity Common Stock, Shares Outstanding		4,861,590