Revenue from contracts with customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2023
Revenue from contracts with customers
Accounts receivable collection period	30 days
Residential customer, annual cost spread period	12 months
Rental income recognition period	1 year
Total revenues	$ 1,938,337	$ 1,837,116	$ 2,026,465
Contract assets and liabilities
Contract assets	8,775	6,199	10,263
Contract liabilities
Deferred revenue	43,490	50,175	51,516
Deferred revenue recognized	37,900	39,500
Propane and related equipment revenues
Revenue from contracts with customers
Total revenues	1,938,337	1,837,116	2,026,465
Retail - Sales to End Users
Revenue from contracts with customers
Total revenues	1,254,562	1,206,226	1,374,089
Wholesale - Sales to Resellers
Revenue from contracts with customers
Total revenues	552,405	510,756	525,529
Other Gas Sales
Revenue from contracts with customers
Total revenues	21,126	14,457	17,274
Other
Revenue from contracts with customers
Total revenues	$ 110,244	$ 105,677	$ 109,573