Document And Entity Information	6 Months Ended
	Jan. 31, 2020 shares
Document Type	10-Q
Document Period End Date	Jan. 31, 2020
Entity Registrant Name	Ferrellgas Partners L P
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	97,152,665
Current Fiscal Year End Date	--07-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000922358
Amendment Flag	false
Ferrellgas Partners Finance Corp. [Member]
Document Type	10-Q
Document Period End Date	Jan. 31, 2020
Entity Registrant Name	Ferrellgas Partners Finance Corp
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	true
Current Fiscal Year End Date	--07-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001012493
Amendment Flag	false
Ferrellgas, L.P. [Member]
Document Type	10-Q
Document Period End Date	Jan. 31, 2020
Entity Registrant Name	Ferrellgas L P
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Current Fiscal Year End Date	--07-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000922359
Amendment Flag	false
Ferrellgas Finance Corp. [Member]
Document Type	10-Q
Document Period End Date	Jan. 31, 2020
Entity Registrant Name	Ferrellgas Finance Corp
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	true
Current Fiscal Year End Date	--07-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000922360
Amendment Flag	false