Accounts And Notes Receivable, Net And Accounts Receivable Securitization - Additional information (Details)					12 Months Ended
	Jul. 01, 2020 USD ($)	Apr. 10, 2020	Apr. 09, 2020	Jun. 25, 2018 USD ($)	Jul. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral					$ 103,703,000	$ 106,145,000
Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral					103,700,000	106,100,000
Total receipts to date					0	62,000,000
Available proceeds from additional trade accounts receivable					$ 11,000,000	0
Increase in interest rate (as a percent)		0.50%
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Required leverage ratio					5.5
Maximum [Member] | Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Margin added to variable rate (as a percent)		4.50%
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Required fixed charge coverage ratio					175.00%
Minimum [Member] | Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Margin added to variable rate (as a percent)		2.50%
Jamex Marketing, LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Note receivable, original principal amount				$ 18,300,000
Notes receivable, payment due	$ 2,500,000
Notes receivable, amount reserved					$ 17,300,000
Notes receivable, current					12,500,000
Accounts Receivable Securitization Facility [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateralized notes payable					$ 0	$ 62,000,000
Weighted average interest rate of debt						5.50%
Margin added to variable rate (as a percent)		1.00%	0.00%
Agreement extension period		3 years
Accounts Receivable Securitization Facility [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Required leverage ratio					3.00
Accounts Receivable Securitization Facility [Member] | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Required fixed charge coverage ratio					100.00%
Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral					$ 103,703,000	$ 106,145,000
Ferrellgas, L.P. [Member] | Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral					103,700,000	106,100,000
Total receipts to date					0	62,000,000
Available proceeds from additional trade accounts receivable					$ 11,000,000	0
Increase in interest rate (as a percent)		0.50%
Ferrellgas, L.P. [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Required leverage ratio					5.5
Ferrellgas, L.P. [Member] | Maximum [Member] | Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Margin added to variable rate (as a percent)		4.50%
Ferrellgas, L.P. [Member] | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Required fixed charge coverage ratio					175.00%
Senior secured leverage ratio					5.5
Ferrellgas, L.P. [Member] | Minimum [Member] | Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Margin added to variable rate (as a percent)		2.50%
Ferrellgas, L.P. [Member] | Jamex Marketing, LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Note receivable, original principal amount				$ 18,300,000
Notes receivable, payment due	$ 2,500,000
Notes receivable, amount reserved					$ 17,300,000
Notes receivable, current					12,500,000
Ferrellgas, L.P. [Member] | Accounts Receivable Securitization Facility [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateralized notes payable					$ 0	$ 62,000,000
Weighted average interest rate of debt						5.50%
Margin added to variable rate (as a percent)		1.00%	0.00%
Agreement extension period		3 years
Ferrellgas, L.P. [Member] | Accounts Receivable Securitization Facility [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Required leverage ratio					3.00
Ferrellgas, L.P. [Member] | Accounts Receivable Securitization Facility [Member] | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Required fixed charge coverage ratio					100.00%