Accounts And Notes Receivable, Net And Accounts Receivable Securitization - Additional information (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jul. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	$ 175,386	$ 106,145
Total receipts to date	$ 121,000	$ 62,000
Weighted average discount rate to value the retained interest in the transferred receivables	4.60%	5.50%
Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	$ 175,386	$ 106,145
Total receipts to date	$ 121,000	$ 62,000
Weighted average discount rate to value the retained interest in the transferred receivables	4.60%	5.50%
Accounts Receivable Securitization Facility [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateralized notes payable	$ 121,000	$ 62,000
Capacity to receive additional proceeds	0	0
Accounts Receivable Securitization Facility [Member] | Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateralized notes payable	121,000	62,000
Capacity to receive additional proceeds	$ 0	$ 0