Derivative instruments and hedging activities - AOCI Rollforward (Details) MMBbls in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2024 USD ($)	Apr. 30, 2023 USD ($)	Apr. 30, 2024 USD ($) MMBbls	Apr. 30, 2023 USD ($)
Derivative instruments and hedging activities
Partners' capital balance, beginning	$ (844,654,000)	$ (873,156,000)	$ (898,791,000)	$ (887,811,000)
Change in value of risk management commodity derivatives	(1,180,000)	(10,621,000)	(116,000)	(53,044,000)
Reclassification of losses on commodity hedges to cost of sales - propane and other gas liquids sales, net	(5,179,000)	13,450,000	75,000	7,378,000
Partners' capital balance, ending	(914,046,000)	(862,141,000)	(914,046,000)	(862,141,000)
Reclassification of net gain to earnings during next 12 months			1,200,000
Gain (loss) on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring, net			$ 0	0
Number of barrels of propane covered by cash flow hedges | MMBbls			1.8
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Derivative instruments and hedging activities
Partners' capital balance, beginning			$ 1,059,000	37,907,000
Change in value of risk management commodity derivatives			(116,000)	(53,044,000)
Reclassification of losses on commodity hedges to cost of sales - propane and other gas liquids sales, net			75,000	7,378,000
Less: amount attributable to noncontrolling interests				(461,000)
Partners' capital balance, ending	1,018,000	(7,298,000)	1,018,000	(7,298,000)
Ferrellgas, L.P.
Derivative instruments and hedging activities
Partners' capital balance, beginning	(844,698,000)	(873,172,000)	(898,851,000)	(887,826,000)
Change in value of risk management commodity derivatives	(1,180,000)	(10,621,000)	(116,000)	(53,044,000)
Reclassification of losses on commodity hedges to cost of sales - propane and other gas liquids sales, net	(5,179,000)	13,450,000	75,000	7,378,000
Partners' capital balance, ending	(914,369,000)	(862,199,000)	(914,369,000)	(862,199,000)
Ferrellgas, L.P. | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Derivative instruments and hedging activities
Partners' capital balance, beginning			1,083,000	38,307,000
Change in value of risk management commodity derivatives			(116,000)	(53,044,000)
Reclassification of losses on commodity hedges to cost of sales - propane and other gas liquids sales, net			75,000	7,378,000
Partners' capital balance, ending	$ 1,042,000	$ (7,359,000)	$ 1,042,000	$ (7,359,000)