Derivative instruments and hedging activities - Balance Sheet (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2024
Derivative instruments and hedging activities
Gain (loss) recognized due to ineffectiveness	$ 0	$ 0
Total Asset Derivatives	3,570	6,519
Total Liability Derivatives	3,654	4,460
Price risk management asset
Derivative instruments and hedging activities
Commodity derivatives propane swap assets	3,244	5,925
Other current liabilities
Derivative instruments and hedging activities
Commodity derivatives propane swap liabilities	3,306	4,379
Other assets, net
Derivative instruments and hedging activities
Commodity derivatives propane swap assets	326	594
Other liabilities
Derivative instruments and hedging activities
Commodity derivatives propane swap liabilities	$ 348	$ 81