Supplemental financial statement information - Shipping and Handling (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2024	Apr. 30, 2023
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	$ 150,629	$ 147,477	$ 454,913	$ 434,572
Depreciation and amortization expense	25,340	23,753	74,179	69,453
Operating expense - equipment lease expense	5,275	5,861	15,994	17,471
Shipping and Handling
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	76,612	78,940	222,500	218,956
Depreciation and amortization expense	3,407	3,651	9,902	12,962
Operating expense - equipment lease expense	3,313	3,502	10,321	9,039
Shipping and handling expenses	$ 83,332	$ 86,093	$ 242,723	$ 240,957