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Revenue from contracts with customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Revenue from contracts with customers
Total revenues	$ 560,847	$ 515,774	$ 1,594,708	$ 1,496,664
Contract assets and liabilities
Contract assets	16,079	13,315	16,079	13,315	$ 20,876
Contract liabilities
Deferred revenue	$ 41,165	42,305	41,165	42,305	$ 40,051
Deferred revenue recognized			$ 35,200	36,900
Maximum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-05-01
Contract liabilities
Remaining performance obligation recognition period	1 year		1 year
Propane and related equipment revenues
Revenue from contracts with customers
Total revenues	$ 560,847	515,774	$ 1,594,708	1,496,664
Retail - Sales to End Users
Revenue from contracts with customers
Total revenues	400,006	367,300	1,078,412	1,033,000
Wholesale - Sales to Resellers
Revenue from contracts with customers
Total revenues	129,667	119,739	409,381	368,088
Other Gas Sales
Revenue from contracts with customers
Total revenues	3,873	3,018	19,578	12,112
Other
Revenue from contracts with customers
Total revenues	$ 27,301	$ 25,717	$ 87,337	$ 83,464