Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2018
Segment Reporting Information
Assets	$ 198,478		$ 198,478		$ 194,682
Net Sales	70,885	$ 64,847	206,908	$ 200,387
Corporate Expenses	(9,288)	(6,485)	(22,424)	(20,509)
Income from Operations	2,327	3,294	6,157	12,692
Total Other Income (Expense), Net	4,377	1	4,219	(487)
Income before Income Taxes	6,704	3,295	10,376	12,205
Income Tax Expense (Benefit)	(1,143)	290	(1,599)	(6,666)
Net Income	5,561	3,585	8,777	5,539
Net Loss Attributable to Noncontrolling Interest	(58)	0	(35)	0
Net Income Attributable to Oil-Dri	5,619	3,585	8,812	5,539
Business to Business Products
Segment Reporting Information
Assets	64,544		64,544		65,143
Segment Income	7,454	7,556	21,758	26,191
Net Sales	26,041	24,784	77,825	79,226
Retail and Wholesale Products
Segment Reporting Information
Assets	90,859		90,859		89,623
Segment Income	4,161	2,223	6,823	7,010
Net Sales	44,844	$ 40,063	129,083	$ 121,161
Unallocated Assets
Segment Reporting Information
Assets	$ 43,075		$ 43,075		$ 39,916