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Leases - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jan. 31, 2021
Jul. 31, 2020
Assets and Liabilities, Lessee [Abstract]    
Operating Lease, Right-of-Use Asset $ 97,249 $ 107,349
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating Lease, Right-of-Use Asset  
Finance Lease, Right-of-Use Asset $ 38,045 41,426
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other Assets, Noncurrent  
Total leased assets $ 135,294 148,775
Operating Lease, Liability, Current $ 27,895 29,345
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current  
Finance Lease, Liability, Current $ 7,405 6,955
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current  
Operating Lease, Liability, Noncurrent $ 80,901 89,022
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating Lease, Liability, Noncurrent  
Finance Lease, Liability, Noncurrent $ 30,537 33,473
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent  
Total leased liabilities $ 146,738 158,795
Ferrellgas, L.P. [Member]    
Assets and Liabilities, Lessee [Abstract]    
Operating Lease, Right-of-Use Asset $ 97,249 107,349
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating Lease, Right-of-Use Asset  
Finance Lease, Right-of-Use Asset $ 38,045 41,426
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other Assets, Noncurrent  
Total leased assets $ 135,294 148,775
Operating Lease, Liability, Current $ 27,895 29,345
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current  
Finance Lease, Liability, Current $ 7,405 6,955
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current  
Operating Lease, Liability, Noncurrent $ 80,901 89,022
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating Lease, Liability, Noncurrent  
Finance Lease, Liability, Noncurrent $ 30,537 33,473
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent  
Total leased liabilities $ 146,738 $ 158,795