Operating Segments Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Revenue by Principal Product
Net Sales	$ 85,761	$ 76,255	$ 255,431	$ 226,852
Business to Business Products
Revenue by Principal Product
Net Sales	31,375	26,293	92,928	80,098
Business to Business Products | Cat Litter
Revenue by Principal Product
Net Sales	4,026	3,214	13,353	10,826
Business to Business Products | Industrial and Sports
Revenue by Principal Product
Net Sales	0	0	0	0
Business to Business Products | Agricultural and Horticultural
Revenue by Principal Product
Net Sales	7,950	6,632	21,469	18,665
Business to Business Products | Bleaching Clay and Fluids Purification
Revenue by Principal Product
Net Sales	14,145	12,171	43,685	37,577
Business to Business Products | Animal Health and Nutrition
Revenue by Principal Product
Net Sales	5,254	4,276	14,421	13,030
Retail and Wholesale Products
Revenue by Principal Product
Net Sales	54,386	49,962	162,503	146,754
Retail and Wholesale Products | Cat Litter
Revenue by Principal Product
Net Sales	43,259	39,941	132,400	121,820
Retail and Wholesale Products | Industrial and Sports
Revenue by Principal Product
Net Sales	10,588	9,505	28,528	23,477
Retail and Wholesale Products | Agricultural and Horticultural
Revenue by Principal Product
Net Sales	0	0	0	0
Retail and Wholesale Products | Bleaching Clay and Fluids Purification
Revenue by Principal Product
Net Sales	539	516	1,575	1,457
Retail and Wholesale Products | Animal Health and Nutrition
Revenue by Principal Product
Net Sales	$ 0	$ 0	$ 0	$ 0