Accounts And Notes Receivable, Net And Accounts Receivable Securitization (Narrative) (Details) (USD $)	6 Months Ended	12 Months Ended
	Jan. 31, 2014	Jul. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	$ 314,475,000	$ 130,025,000
Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	314,475,000	130,025,000
Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	314,500,000	130,000,000
Collateralized notes payable	219,000,000	82,000,000
Proceeds from accounts receivable securitization	219,000,000	82,000,000
Available proceeds from additional trade accounts receivable	0	0
Weighted average interest rate on borrowings under accounts receivable securitization	2.00%	2.40%
Accounts Receivable Securitization [Member] | Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	314,500,000	130,000,000
Collateralized notes payable	219,000,000	82,000,000
Proceeds from accounts receivable securitization	219,000,000	82,000,000
Available proceeds from additional trade accounts receivable	$ 0	$ 0
Weighted average interest rate on borrowings under accounts receivable securitization	2.00%	2.40%