v3.19.3
Document And Entity Information - USD ($)
12 Months Ended
Jul. 31, 2019
Aug. 31, 2019
Jan. 31, 2019
Document Type 10-K    
Document Period End Date Jul. 31, 2019    
Entity Registrant Name Ferrellgas Partners L P    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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  
Entity Public Float     $ 90,739,225
Current Fiscal Year End Date --07-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000922358    
Amendment Flag false    
Ferrellgas Partners Finance Corp. [Member]      
Document Type 10-K    
Document Period End Date Jul. 31, 2019    
Entity Registrant Name FERRELLGAS PARTNERS FINANCE CORP    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001012493    
Amendment Flag false    
Ferrellgas, L.P. [Member]      
Document Type 10-K    
Document Period End Date Jul. 31, 2019    
Entity Registrant Name FERRELLGAS L P    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000922359    
Amendment Flag false    
Ferrellgas Finance Corp. [Member]      
Document Type 10-K    
Document Period End Date Jul. 31, 2019    
Entity Registrant Name FERRELLGAS FINANCE CORP    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000922360    
Amendment Flag false