Consolidated Statements of Stockholders Equity Statement - USD ($) $ in Thousands	Total	Common & Class B Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Total, Beginning of Period at Jul. 31, 2020	$ 147,964	$ 1,089	$ 44,993	$ 176,579	$ (62,269)	$ (12,254)	$ (174)
Common & Class B Stock, Beginning of Period (in shares) at Jul. 31, 2020		10,886,405
Treasury Stock, Beginning of Period (in shares) at Jul. 31, 2020					(3,426,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Oil-Dri	8,283	$ 0	0	8,283	$ 0	0
Net Loss Attributable to Noncontrolling Interest	(46)						(46)
Net Income, Including Portion Attributable to Noncontrolling Interest	8,237
Other Comprehensive (Loss) Income	737	0	0	0	0	737	0
Dividends Declared	(3,597)	0	0	(3,597)	0	0	0
Purchases of Treasury Stock	(2,189)	0	0	0	$ (2,189)	0	0
Purchases of Treasury Stock (in shares)					(60,587)
Net issuance of stock under long-term incentive plans	1	$ 5	607	0	$ 613	0	0
Net issuance of stock under long-term incentive plans (in shares)		(51,212)			(21,150)
Amortization of Restricted Stock	1,290	$ 0	1,290	0	$ 0	0	0
Total, End of Period at Jan. 31, 2021	152,441	$ 1,094	46,890	181,265	$ (65,071)	(11,517)	(220)
Common Stock & Class B Stock, End of Period (in shares) at Jan. 31, 2021		10,937,617
Treasury Stock, End of Period (in shares) at Jan. 31, 2021					(3,507,783)
Total, Beginning of Period at Oct. 31, 2020	150,316	$ 1,092	45,779	178,761	$ (63,253)	(11,854)	(209)
Common & Class B Stock, Beginning of Period (in shares) at Oct. 31, 2020		10,919,617
Treasury Stock, Beginning of Period (in shares) at Oct. 31, 2020					(3,453,239)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Oil-Dri	4,299	$ 0	0	4,299	$ 0	0
Net Loss Attributable to Noncontrolling Interest	(11)						(11)
Net Income, Including Portion Attributable to Noncontrolling Interest	4,288
Other Comprehensive (Loss) Income	337	0	0	0	0	337	0
Dividends Declared	(1,795)	0	0	(1,795)	0	0	0
Purchases of Treasury Stock	(1,211)	0	0	0	$ (1,211)	0	0
Purchases of Treasury Stock (in shares)					(33,594)
Net issuance of stock under long-term incentive plans	0	$ 2	605	0	$ 607	0	0
Net issuance of stock under long-term incentive plans (in shares)		(18,000)			(20,950)
Amortization of Restricted Stock	506	$ 0	506	0	$ 0	0	0
Total, End of Period at Jan. 31, 2021	152,441	$ 1,094	46,890	181,265	$ (65,071)	(11,517)	(220)
Common Stock & Class B Stock, End of Period (in shares) at Jan. 31, 2021		10,937,617
Treasury Stock, End of Period (in shares) at Jan. 31, 2021					(3,507,783)
Total, Beginning of Period at Jul. 31, 2021	159,232	$ 1,096	48,271	180,443	$ (66,154)	(4,117)	(307)
Common & Class B Stock, Beginning of Period (in shares) at Jul. 31, 2021		10,958,367
Treasury Stock, Beginning of Period (in shares) at Jul. 31, 2021					(3,539,193)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Oil-Dri	2,587	$ 0	0	2,587	$ 0	0
Net Loss Attributable to Noncontrolling Interest	(31)						(31)
Net Income, Including Portion Attributable to Noncontrolling Interest	2,556
Other Comprehensive (Loss) Income	(41)	0	0	0	0	(41)	0
Dividends Declared	(3,708)	0	0	(3,708)	0	0	0
Purchases of Treasury Stock	(6,201)	0	0	0	$ (6,201)	0	0
Purchases of Treasury Stock (in shares)					(179,003)
Net issuance of stock under long-term incentive plans	0	$ 11	496	0	$ 507	0	0
Net issuance of stock under long-term incentive plans (in shares)		(106,657)			(14,400)
Amortization of Restricted Stock	1,453	$ 0	1,453	0	$ 0	0	0
Total, End of Period at Jan. 31, 2022	153,291	$ 1,107	50,220	179,322	$ (72,862)	(4,158)	(338)
Common Stock & Class B Stock, End of Period (in shares) at Jan. 31, 2022		11,065,024
Treasury Stock, End of Period (in shares) at Jan. 31, 2022					(3,732,596)
Total, Beginning of Period at Oct. 31, 2021	156,301	$ 1,103	49,377	179,164	$ (68,922)	(4,124)	(297)
Common & Class B Stock, Beginning of Period (in shares) at Oct. 31, 2021		11,033,024
Treasury Stock, Beginning of Period (in shares) at Oct. 31, 2021					(3,618,510)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Oil-Dri	2,002	$ 0	0	2,002	$ 0	0
Net Loss Attributable to Noncontrolling Interest	(41)						(41)
Net Income, Including Portion Attributable to Noncontrolling Interest	1,961
Other Comprehensive (Loss) Income	(34)	0	0	0	0	(34)	0
Dividends Declared	(1,844)	0	0	(1,844)	0	0	0
Purchases of Treasury Stock	(3,910)	0	0	0	$ (3,910)	0	0
Purchases of Treasury Stock (in shares)					(113,236)
Net issuance of stock under long-term incentive plans	0	$ 4	26	0	$ 30	0	0
Net issuance of stock under long-term incentive plans (in shares)		(32,000)			(850)
Amortization of Restricted Stock	817	$ 0	817	0	$ 0	0	0
Total, End of Period at Jan. 31, 2022	$ 153,291	$ 1,107	$ 50,220	$ 179,322	$ (72,862)	$ (4,158)	$ (338)
Common Stock & Class B Stock, End of Period (in shares) at Jan. 31, 2022		11,065,024
Treasury Stock, End of Period (in shares) at Jan. 31, 2022					(3,732,596)