Document And Entity Information - USD ($)	12 Months Ended
	Jul. 31, 2022	Aug. 31, 2022	Jan. 31, 2022
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jul. 31, 2022
Current Fiscal Year End Date	--07-31
Document Transition Report	false
Entity File Number	001-11331
Entity Registrant Name	Ferrellgas Partners L P
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	43-1698480
Entity Address, Address Line One	One Liberty Plaza
Entity Address, City or Town	Liberty
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	64068
City Area Code	816
Local Phone Number	792-1600
Title of 12(b) Security	N/A
No Trading Symbol Flag	true
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 59,054,417
Auditor Name	GRANT THORNTON LLP
Auditor Firm ID	248
Auditor Location	Kansas City, Missouri
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Central Index Key	0000922358
Amendment Flag	false
Class A Limited Partner Units
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		4,857,605
Class B Limited Partner Units
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,300,000
Ferrellgas, L.P. [Member]
Document Information [Line Items]
Document Type	10-K
Document Period End Date	Jul. 31, 2022
Current Fiscal Year End Date	--07-31
Entity File Number	000-50182
Entity Registrant Name	FERRELLGAS L P
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	43-1698481
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Auditor Name	GRANT THORNTON LLP
Auditor Firm ID	248
Auditor Location	Kansas City, Missouri
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Central Index Key	0000922359
Amendment Flag	false
Ferrellgas Partners Finance Corp. [Member]
Document Information [Line Items]
Document Type	10-K
Document Period End Date	Jul. 31, 2022
Current Fiscal Year End Date	--07-31
Entity File Number	333-06693-02
Entity Registrant Name	Ferrellgas Partners Finance Corp.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	43-1742520
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	true
Entity Common Stock, Shares Outstanding		1,000
Auditor Name	GRANT THORNTON LLP
Auditor Firm ID	248
Auditor Location	Kansas City, Missouri
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Central Index Key	0001012493
Amendment Flag	false
Ferrellgas Finance Corp. [Member]
Document Information [Line Items]
Document Type	10-K
Document Period End Date	Jul. 31, 2022
Current Fiscal Year End Date	--07-31
Entity File Number	000-50183
Entity Registrant Name	FERRELLGAS FINANCE CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	14-1866671
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	true
Entity Common Stock, Shares Outstanding		1,000
Auditor Name	GRANT THORNTON LLP
Auditor Firm ID	248
Auditor Location	Kansas City, Missouri
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Central Index Key	0000922360
Amendment Flag	false