Partnership Organization And Formation (Details)		9 Months Ended
	Mar. 30, 2021 USD ($) item	Apr. 30, 2022 USD ($) employee item subsidiary shares	Apr. 30, 2021 USD ($)	Jul. 31, 2021 USD ($) shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of states in which entity operates		50
Senior preferred units, units outstanding | shares		700,000		700,000
Preferred Units aggregate initial liquidation preference		$ 700,000,000.0
Senior preferred units, carrying amount		651,349,000		$ 651,349,000
Proceeds from issuance of long-term debt			$ 1,475,000,000
Aggregate redemption price	$ 2,175,000,000.0	$ 2,175,000,000.0
Number of employees | employee		0
Class A Limited Partner Units
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Conversion ratio	0.05
Fixed Rate Eight Point Six Two Five Due Two Thousand Twenty [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Aggregate principal amount	$ 357,000,000.0
Interest rate, as a percent	8.625%
Senior Notes 5.375 Percent Due 2026 And Senior Notes 5.875 Percent Due 2029 [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of subsidiaries | item	2
Proceeds from issuance of long-term debt	$ 1,441,200,000
Senior Notes 5.375 Percent Due 2026 [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Aggregate principal amount	$ 650,000,000.0
Interest rate, as a percent	5.375%	5.375%
Senior Notes 5.875 Percent Due 2029 [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Aggregate principal amount	$ 825,000,000.0
Interest rate, as a percent	5.875%	5.875%
Fixed rate 10.00% Due 2025
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest rate, as a percent	10.00%	10.00%
Fixed Rate Six Point Five Zero Due Two Thousand Twenty One [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest rate, as a percent	6.50%	6.50%
Fixed Rate Six Point Seven Five Due Two Thousand twenty Two [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest rate, as a percent	6.75%	6.75%
Fixed Rate Six Point Seven Five Due Two Thousand Twenty Three [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest rate, as a percent	6.75%	6.75%
Revolving Credit Facility [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Debt Instrument, Term	4 years
Line of Credit Facility, Maximum Borrowing Capacity	$ 350,000,000.0	$ 350,000,000.0
Sublimit, initial period	$ 225,000,000.0
Duration of initial period for sublimit	60 days
Sublimit, after initial period	$ 200,000,000.0
Ferrellgas Partners LP [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of subsidiaries | subsidiary		2
Ferrellgas Partners LP [Member] | Ferrellgas, L.P. [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Limited partner interest		99.00%
Ferrellgas Partners LP [Member] | Ferrellgas Partners Finance Corp. [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership percentage		100.00%
Ferrell Companies [Member] | Ferrellgas Partners LP [Member] | Class A Limited Partner Units
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership percentage		23.40%
Ferrellgas Inc., General Partner [Member] | Ferrellgas [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
General partner ownership interest		2.00%	2.00%
Ferrellgas Inc., General Partner [Member] | Ferrellgas Partners LP [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
General partner ownership interest		1.00%
Ferrellgas Inc., General Partner [Member] | Ferrellgas, L.P. [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
General partner ownership interest		1.0101%	1.0101%
Ferrellgas, L.P. [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of states in which entity operates | item		50
Senior preferred units, units outstanding | shares		700,000		700,000
Preferred Units aggregate initial liquidation preference		$ 700,000,000.0
Senior preferred units, carrying amount		$ 651,349,000		$ 651,349,000
Proceeds from issuance of long-term debt			$ 1,475,000,000
Number of employees | employee		0
Ferrellgas, L.P. [Member] | Senior Notes 5.375 Percent Due 2026 And Senior Notes 5.875 Percent Due 2029 [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of subsidiaries | item		2
Proceeds from issuance of long-term debt		$ 1,441,200,000
Ferrellgas, L.P. [Member] | Senior Notes 5.375 Percent Due 2026 [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Aggregate principal amount		$ 650,000,000.0
Interest rate, as a percent		5.375%
Ferrellgas, L.P. [Member] | Senior Notes 5.875 Percent Due 2029 [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Aggregate principal amount		$ 825,000,000.0
Interest rate, as a percent		5.875%
Ferrellgas, L.P. [Member] | Revolving Credit Facility [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Debt Instrument, Term		4 years
Line of Credit Facility, Maximum Borrowing Capacity		$ 350,000,000.0
Sublimit, initial period		$ 225,000,000.0
Duration of initial period for sublimit		60 days
Sublimit, after initial period		$ 200,000,000.0
Ferrellgas, L.P. [Member] | Ferrellgas Finance Corp. [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership percentage		100.00%
Ferrellgas Partners Finance Corp. [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common stock shares outstanding | shares		1,000		1,000
Corporation formation proceeds from partnership		$ 1,000
Corporation formation shares granted to partnership | shares		1,000,000
Number of employees | employee		0
Ferrellgas Finance Corp. [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common stock shares outstanding | shares		1,000
Corporation formation proceeds from partnership		$ 1,000
Corporation formation shares granted to partnership | shares		1,000,000
Number of employees | employee		0
Ferrellgas Employee Stock Ownership Trust [Member] | Ferrell Companies [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership percentage		100.00%