Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jul. 31, 2020
Assets and Liabilities, Lessee [Abstract]
Operating Lease, Right-of-Use Asset	$ 100,349	$ 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	$ 39,753	41,426
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets, Noncurrent
Total leased assets	$ 140,102	148,775
Operating Lease, Liability, Current	$ 28,280	29,345
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Operating Lease, Liability, Current
Finance Lease, Liability, Current	$ 7,186	6,955
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current
Operating Lease, Liability, Noncurrent	$ 83,337	89,022
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Operating Lease, Liability, Noncurrent
Finance Lease, Liability, Noncurrent	$ 32,033	33,473
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent
Total leased liabilities	$ 150,836	158,795
Ferrellgas, L.P. [Member]
Assets and Liabilities, Lessee [Abstract]
Operating Lease, Right-of-Use Asset	$ 100,349	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	$ 39,753	41,426
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets, Noncurrent
Total leased assets	$ 140,102	148,775
Operating Lease, Liability, Current	$ 28,280	29,345
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Operating Lease, Liability, Current
Finance Lease, Liability, Current	$ 7,186	6,955
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current
Operating Lease, Liability, Noncurrent	$ 83,337	89,022
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Operating Lease, Liability, Noncurrent
Finance Lease, Liability, Noncurrent	$ 32,033	33,473
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent
Total leased liabilities	$ 150,836	$ 158,795