Leases - Lease Expenses (Details) $ in Thousands	12 Months Ended
	Jul. 31, 2020 USD ($)
Lease, Cost [Abstract]
Operating lease expense	$ 41,487
Short-term expense	7,690
Variable lease expense	4,525
Total finance lease expense	3,673
Total lease expense	57,375
Midstream Operations [Member]
Lease, Cost [Abstract]
Total lease expense	500
Operating expenses - personnel, vehicle, plant and other
Lease, Cost [Abstract]
Operating lease expense	7,450
Short-term expense	7,188
Variable lease expense	2,883
Operating expense - equipment lease expense
Lease, Cost [Abstract]
Operating lease expense	30,994
Variable lease expense	1,642
Cost of Sales [Member]
Lease, Cost [Abstract]
Operating lease expense	1,553
General and Administrative Expense [Member]
Lease, Cost [Abstract]
Operating lease expense	1,490
Short-term expense	502
Depreciation And Amortization Expense [Member]
Lease, Cost [Abstract]
Amortization of leased assets	2,613
Interest Expense [Member]
Lease, Cost [Abstract]
Interest on lease liabilities	1,060
Ferrellgas, L.P. [Member]
Lease, Cost [Abstract]
Operating lease expense	41,487
Short-term expense	7,690
Variable lease expense	4,525
Total finance lease expense	3,673
Total lease expense	57,375
Ferrellgas, L.P. [Member] | Midstream Operations [Member]
Lease, Cost [Abstract]
Total lease expense	500
Ferrellgas, L.P. [Member] | Operating expenses - personnel, vehicle, plant and other
Lease, Cost [Abstract]
Operating lease expense	7,450
Short-term expense	7,188
Variable lease expense	2,883
Ferrellgas, L.P. [Member] | Operating expense - equipment lease expense
Lease, Cost [Abstract]
Operating lease expense	30,994
Variable lease expense	1,642
Ferrellgas, L.P. [Member] | Cost of Sales [Member]
Lease, Cost [Abstract]
Operating lease expense	1,553
Ferrellgas, L.P. [Member] | General and Administrative Expense [Member]
Lease, Cost [Abstract]
Operating lease expense	1,490
Short-term expense	502
Ferrellgas, L.P. [Member] | Depreciation And Amortization Expense [Member]
Lease, Cost [Abstract]
Amortization of leased assets	2,613
Ferrellgas, L.P. [Member] | Interest Expense [Member]
Lease, Cost [Abstract]
Interest on lease liabilities	$ 1,060