Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018	Jul. 31, 2018
Segment Reporting Information
Assets	$ 193,137		$ 193,137		$ 194,682
Net Sales	69,880	$ 68,894	136,023	$ 135,540
Corporate Expenses	(7,098)	(6,998)	(13,136)	(14,024)
Income from Operations	2,827	5,183	3,830	9,398
Total Other Expense, Net	(39)	(112)	(158)	(488)
Income before Income Taxes	2,788	5,071	3,672	8,910
Income Tax Expense	(506)	(6,167)	(456)	(6,956)
Net Income (Loss)	2,282	(1,096)	3,216	1,954
Net Income (Loss) Attributable to Noncontrolling Interest	(5)	0	23	0
Net Income (Loss) Attributable to Oil-Dri	2,287	(1,096)	3,193	1,954
Business to Business Products
Segment Reporting Information
Assets	60,283		60,283		65,143
Segment Income	7,272	9,759	14,304	18,635
Net Sales	26,458	27,355	51,784	54,442
Retail and Wholesale Products
Segment Reporting Information
Assets	93,950		93,950		89,623
Segment Income	2,653	2,422	2,662	4,787
Net Sales	43,422	$ 41,539	84,239	$ 81,098
Unallocated Assets
Segment Reporting Information
Assets	$ 38,904		$ 38,904		$ 39,916