Contingencies And Commitments (Details)		3 Months Ended			9 Months Ended
	Feb. 02, 2017 item	Apr. 30, 2019 USD ($) item	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Apr. 30, 2019 USD ($) item
Loss Contingencies [Line Items]
Number of quarters for required fixed charge coverage ratio					4
Maximum restricted payments | $					$ 50,000,000
Number of quarters for restricted payments					16
Current fixed charge coverage ratio					1.38
Dividends allowed | $		$ 0	$ 0	$ 0
Minimum [Member]
Loss Contingencies [Line Items]
Required fixed charge coverage ratio					1.75
Maximum [Member]
Loss Contingencies [Line Items]
Current fixed charge coverage ratio					1.75
Class Action Related To Cylinder Fill Level [Member]
Loss Contingencies [Line Items]
Number of cases		1			1
Lawsuit Related To Sale Of Jamex Transfer Services [Member]
Loss Contingencies [Line Items]
Number of former officers	2
Ferrellgas Partners Finance Corp. [Member] | Fixed Rate Eight Point Six Two Five Due Two Thousand Twenty [Member]
Loss Contingencies [Line Items]
Potential liability as co-issuer and co-obligor | $		$ 357,000,000			$ 357,000,000
Ferrellgas Partners Finance Corp. [Member] | Fixed Rate Six Point Five Zero Due Two Thousand Twenty One [Member]
Loss Contingencies [Line Items]
Potential liability as co-issuer and co-obligor | $		500,000,000			500,000,000
Ferrellgas Partners Finance Corp. [Member] | Fixed Rate Six Point Seven Five Due Two Thousand Twenty Three [Member]
Loss Contingencies [Line Items]
Potential liability as co-issuer and co-obligor | $		500,000,000			500,000,000
Ferrellgas Partners Finance Corp. [Member] | Fixed Rate Six Point Seven Five Due Two Thousand twenty Two [Member]
Loss Contingencies [Line Items]
Potential liability as co-issuer and co-obligor | $		$ 475,000,000			$ 475,000,000
Ferrellgas Finance Corp. [Member]
Loss Contingencies [Line Items]
Number of quarters for required fixed charge coverage ratio					4
Required fixed charge coverage ratio					1.75
Current fixed charge coverage ratio					1.72
Ferrellgas, L.P. [Member]
Loss Contingencies [Line Items]
Number of quarters for required fixed charge coverage ratio					4
Current fixed charge coverage ratio					1.72
Ferrellgas, L.P. [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Required fixed charge coverage ratio					1.75
Ferrellgas, L.P. [Member] | Class Action Related To Cylinder Fill Level [Member]
Loss Contingencies [Line Items]
Number of cases		1			1
Ferrellgas, L.P. [Member] | Lawsuit Related To Sale Of Jamex Transfer Services [Member]
Loss Contingencies [Line Items]
Number of former officers	2