Document and Entity Information Document - USD ($)	12 Months Ended
	Jul. 31, 2019	Sep. 30, 2019	Jan. 31, 2019
Entity Information [Line Items]
Entity Registrant Name	Oil-Dri Corp of America
Entity Central Index Key	0000074046
Current Fiscal Year End Date	--07-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Document Type	10-K
Document Period End Date	Jul. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 135,930,000
Entity Emerging Growth Company	false
Entity Shell Company	false
Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		5,356,902
Common Class B
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		2,251,738