Derivative Instruments and Hedging Activities - AOCI Rollforward (Details)	12 Months Ended
	Jul. 31, 2022 USD ($) MMBbls	Jul. 31, 2021 USD ($)	Jul. 31, 2020 USD ($)
Derivative [Line Items]
Partners' capital balance, beginning	$ (823,079,000)	$ (1,208,268,000)	$ (1,138,938,000)
Change in value of risk management commodity derivatives	68,950,000	136,351,000	(22,872,000)
Reclassification of (gains) losses on commodity hedges to cost of sales - propane and other gas liquids sales, net	(120,429,000)	(44,252,000)	35,315,000
Partners' capital balance, ending	(887,811,000)	(823,079,000)	(1,208,268,000)
Reclassification of net gain to earnings during next 12 months	31,200,000
Gain (loss) on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring, net	$ 0	0	0
Number of barrels of propane covered by cash flow hedges | MMBbls	4.8
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Derivative [Line Items]
Partners' capital balance, beginning	$ 88,866,000	(2,303,000)
Less: amount attributable to noncontrolling interests	520,000	(930,000)
Partners' capital balance, ending	37,907,000	88,866,000	(2,303,000)
Accumulated Net Gain (Loss) from Cash Flow Hedges, pre-adoption
Derivative [Line Items]
Partners' capital balance, beginning		(2,303,000)	(14,756,000)
Less: amount attributable to noncontrolling interests			10,000
Partners' capital balance, ending			(2,303,000)
Non-Controlling Interest [Member]
Derivative [Line Items]
Partners' capital balance, beginning	(7,966,000)	(8,226,000)	(7,705,000)
Partners' capital balance, ending	(7,587,000)	(7,966,000)	(8,226,000)
Commodity Derivatives Propane [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Derivative [Line Items]
Change in value of risk management commodity derivatives	68,950,000	136,351,000
Reclassification of (gains) losses on commodity hedges to cost of sales - propane and other gas liquids sales, net	(120,429,000)	(44,252,000)
Commodity Derivatives Propane [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges, pre-adoption
Derivative [Line Items]
Change in value of risk management commodity derivatives			(22,872,000)
Reclassification of (gains) losses on commodity hedges to cost of sales - propane and other gas liquids sales, net			35,315,000
Ferrellgas, L.P. [Member]
Derivative [Line Items]
Partners' capital balance, beginning	(806,143,000)	(831,991,000)	(780,403,000)
Change in value of risk management commodity derivatives	68,950,000	136,351,000	(22,872,000)
Reclassification of (gains) losses on commodity hedges to cost of sales - propane and other gas liquids sales, net	(120,429,000)	(44,252,000)	35,315,000
Partners' capital balance, ending	(887,826,000)	(806,143,000)	(831,991,000)
Ferrellgas, L.P. [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Derivative [Line Items]
Partners' capital balance, beginning	89,786,000	(2,313,000)	(14,756,000)
Partners' capital balance, ending	38,307,000	89,786,000	(2,313,000)
Ferrellgas, L.P. [Member] | Commodity Derivatives Propane [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Derivative [Line Items]
Change in value of risk management commodity derivatives	68,950,000	136,351,000	(22,872,000)
Reclassification of (gains) losses on commodity hedges to cost of sales - propane and other gas liquids sales, net	$ (120,429,000)	$ (44,252,000)	$ 35,315,000