Document And Entity Information - USD ($)	12 Months Ended
	Jul. 31, 2017	Sep. 01, 2017	Jan. 31, 2017
Entity Registrant Name	FERRELLGAS PARTNERS L P
Entity Central Index Key	0000922358
Current Fiscal Year End Date	--07-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Jul. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		97,152,665
Trading Symbol	fgp
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 560,798,162
Ferrellgas Partners Finance Corp. [Member]
Entity Registrant Name	FERRELLGAS PARTNERS FINANCE CORP
Entity Central Index Key	0001012493
Current Fiscal Year End Date	--07-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-K
Document Period End Date	Jul. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		1,000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Ferrellgas, L.P. [Member]
Entity Registrant Name	FERRELLGAS L P
Entity Central Index Key	0000922359
Current Fiscal Year End Date	--07-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-K
Document Period End Date	Jul. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Ferrellgas Finance Corp. [Member]
Entity Registrant Name	FERRELLGAS FINANCE CORP
Entity Central Index Key	0000922360
Current Fiscal Year End Date	--07-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-K
Document Period End Date	Jul. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		1,000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes