Summary Of Significant Accounting Policies (New Accounting Standards) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Significant Accounting Policies [Line Items]
Operating Lease, Liability	$ 118,367
Operating Lease, Right-of-Use Asset	$ 107,349
Lease, Practical Expedient, Lessor Single Lease Component [true false]		true
Lease, Practical Expedients, Package [true false]		true
Lease, Practical Expedient, Use of Hindsight [true false]		false
Ferrellgas Partners LP [Member]
Significant Accounting Policies [Line Items]
General partner ownership interest	2.00%	2.00%
Ferrellgas Inc., General Partner [Member] | Ferrellgas Partners LP [Member]
Significant Accounting Policies [Line Items]
General partner ownership interest	1.00%
Ferrellgas, L.P. [Member]
Significant Accounting Policies [Line Items]
Operating Lease, Liability	$ 118,367
Operating Lease, Right-of-Use Asset	$ 107,349
Lease, Practical Expedient, Lessor Single Lease Component [true false]		true
Lease, Practical Expedients, Package [true false]		true
Lease, Practical Expedient, Use of Hindsight [true false]		false