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 (Loss) Income Attributable to Oil-Dri	10,510	$ 0	0	10,510	$ 0	0
Net Loss Attributable to Noncontrolling Interest	(87)						(87)
Net (Loss) Income, Including Portion Attributable to Noncontrolling Interest	10,423
Other Comprehensive (Loss) Income	1,014	0	0	0	0	1,014	0
Dividends Declared	(5,386)	0	0	(5,386)	0	0	0
Purchases of Treasury Stock	(2,925)	0	0	0	$ (2,925)	0	0
Purchases of Treasury Stock (in shares)					(81,746)
Net issuance of stock under long-term incentive plans	0	$ 5	749	0	$ 754	0	0
Net issuance of stock under long-term incentive plans (in shares)		(56,212)			(25,500)
Amortization of Restricted Stock	1,849	$ 0	1,849	0	$ 0	0	0
Total, End of Period at Apr. 30, 2021	152,939	$ 1,094	47,591	181,703	$ (65,948)	(11,240)	(261)
Common Stock & Class B Stock, End of Period (in shares) at Apr. 30, 2021		10,942,617
Treasury Stock, End of Period (in shares) at Apr. 30, 2021					(3,533,292)
Total, Beginning of Period at Jan. 31, 2021	152,441	$ 1,094	46,890	181,265	$ (65,071)	(11,517)	(220)
Common & Class B Stock, Beginning of Period (in shares) at Jan. 31, 2021		10,937,617
Treasury Stock, Beginning of Period (in shares) at Jan. 31, 2021					(3,507,783)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss) Income Attributable to Oil-Dri	2,227	$ 0	0	2,227	$ 0	0
Net Loss Attributable to Noncontrolling Interest	(41)						(41)
Net (Loss) Income, Including Portion Attributable to Noncontrolling Interest	2,186
Other Comprehensive (Loss) Income	277	0	0	0	0	277	0
Dividends Declared	(1,789)	0	0	(1,789)	0	0	0
Purchases of Treasury Stock	(736)	0	0	0	$ (736)	0	0
Purchases of Treasury Stock (in shares)					(21,159)
Net issuance of stock under long-term incentive plans	1	$ 0	142	0	$ 141	0	0
Net issuance of stock under long-term incentive plans (in shares)		(5,000)			(4,350)
Amortization of Restricted Stock	559	$ 0	559	0	$ 0	0	0
Total, End of Period at Apr. 30, 2021	152,939	$ 1,094	47,591	181,703	$ (65,948)	(11,240)	(261)
Common Stock & Class B Stock, End of Period (in shares) at Apr. 30, 2021		10,942,617
Treasury Stock, End of Period (in shares) at Apr. 30, 2021					(3,533,292)
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 (Loss) Income Attributable to Oil-Dri	478	$ 0	0	478	$ 0	0
Net Loss Attributable to Noncontrolling Interest	(55)						(55)
Net (Loss) Income, Including Portion Attributable to Noncontrolling Interest	423
Other Comprehensive (Loss) Income	(108)	0	0	0	0	(108)	0
Dividends Declared	(5,553)	0	0	(5,553)	0	0	0
Purchases of Treasury Stock	(10,506)	0	0	0	$ (10,506)	0	0
Purchases of Treasury Stock (in shares)					(330,916)
Net issuance of stock under long-term incentive plans	0	$ 12	579	0	$ 591	0	0
Net issuance of stock under long-term incentive plans (in shares)		(121,657)			(17,100)
Amortization of Restricted Stock	2,267	$ 0	2,267	0	$ 0	0	0
Total, End of Period at Apr. 30, 2022	145,755	$ 1,108	51,117	175,368	$ (77,251)	(4,225)	(362)
Common Stock & Class B Stock, End of Period (in shares) at Apr. 30, 2022		11,080,024
Treasury Stock, End of Period (in shares) at Apr. 30, 2022					(3,887,209)
Total, Beginning of Period at Jan. 31, 2022	153,291	$ 1,107	50,220	179,322	$ (72,862)	(4,158)	(338)
Common & Class B Stock, Beginning of Period (in shares) at Jan. 31, 2022		11,065,024
Treasury Stock, Beginning of Period (in shares) at Jan. 31, 2022					(3,732,596)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss) Income Attributable to Oil-Dri	(2,109)	$ 0	0	(2,109)	$ 0	0
Net Loss Attributable to Noncontrolling Interest	(24)						(24)
Net (Loss) Income, Including Portion Attributable to Noncontrolling Interest	(2,133)
Other Comprehensive (Loss) Income	(67)	0	0	0	0	(67)	0
Dividends Declared	(1,845)	0	0	(1,845)	0	0	0
Purchases of Treasury Stock	(4,305)	0	0	0	$ (4,305)	0	0
Purchases of Treasury Stock (in shares)					(151,913)
Net issuance of stock under long-term incentive plans	0	$ 1	83	0	$ 84	0	0
Net issuance of stock under long-term incentive plans (in shares)		(15,000)			(2,700)
Amortization of Restricted Stock	814	$ 0	814	0	$ 0	0	0
Total, End of Period at Apr. 30, 2022	$ 145,755	$ 1,108	$ 51,117	$ 175,368	$ (77,251)	$ (4,225)	$ (362)
Common Stock & Class B Stock, End of Period (in shares) at Apr. 30, 2022		11,080,024
Treasury Stock, End of Period (in shares) at Apr. 30, 2022					(3,887,209)