Accounts And Notes Receivable, Net And Accounts Receivable Securitization (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Oct. 31, 2016	Jul. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
current leverage ratio	581.00%
Accounts receivable pledged as collateral	$ 105,320,000	$ 106,464,000
Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
current leverage ratio	581.00%
Accounts receivable pledged as collateral	$ 105,320,000	106,464,000
Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	105,300,000	106,500,000
Collateralized notes payable	74,000,000	64,000,000
Proceeds from accounts receivable securitization	74,000,000	64,000,000
Available proceeds from additional trade accounts receivable	$ 0	$ 0
Weighted average interest rate on borrowings under accounts receivable securitization	2.70%	3.00%
Accounts Receivable Securitization [Member] | Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	$ 105,300,000	$ 106,500,000
Collateralized notes payable	74,000,000	64,000,000
Proceeds from accounts receivable securitization	74,000,000	64,000,000
Available proceeds from additional trade accounts receivable	$ 0	$ 0
Weighted average interest rate on borrowings under accounts receivable securitization	2.70%	3.00%