Revenue from contracts with customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Jul. 31, 2023
Revenue from contracts with customers
Total revenues	$ 371,013	$ 413,289
Contract assets and liabilities
Contract assets	4,771		$ 10,263
Contract liabilities
Deferred revenue	59,147		$ 51,516
Deferred revenue recognized	$ 16,100
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-11-01
Contract liabilities
Remaining performance obligation recognition period	1 year
Propane And Related Equipment
Revenue from contracts with customers
Total revenues	$ 371,013	413,289
Retail Sales To End Users
Revenue from contracts with customers
Total revenues	227,860	265,974
Wholesale Sales To Resellers
Revenue from contracts with customers
Total revenues	105,523	116,014
Other Gas Sales
Revenue from contracts with customers
Total revenues	5,551	3,856
Other
Revenue from contracts with customers
Total revenues	$ 32,079	$ 27,445