Accounts And Notes Receivable, Net And Accounts Receivable Securitization (Narrative) (Details) (USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	$ 130,025,000	$ 121,812,000
Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	130,025,000	121,812,000
Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable securitization program, maximum capacity	225,000,000
Accounts receivable securitization program, maturity date	Jan. 19, 2017
Accounts receivable pledged as collateral	130,000,000	121,800,000
Available proceeds from additional trade accounts receivable	0	0
Weighted average discount rate to value the retained interest in the transferred receivables	2.40%	2.60%
Note payable	82,000,000	74,000,000
Proceeds from Accounts Receivable Securitization	82,000,000	74,000,000
Accounts Receivable Securitization [Member] | Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable securitization program, maximum capacity	225,000,000.0
Accounts receivable securitization program, maturity date	Jan. 19, 2017
Accounts receivable pledged as collateral	130,000,000	121,800,000
Available proceeds from additional trade accounts receivable	0	0
Weighted average discount rate to value the retained interest in the transferred receivables	2.40%	2.60%
Note payable	82,000,000	74,000,000
Proceeds from Accounts Receivable Securitization	82,000,000	74,000,000
Maximum [Member] | Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease in interest rate from previous facility	1.45%
Maximum [Member] | Accounts Receivable Securitization [Member] | Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease in interest rate from previous facility	1.45%
Minimum [Member] | Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease in interest rate from previous facility	1.20%
Minimum [Member] | Accounts Receivable Securitization [Member] | Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease in interest rate from previous facility	1.20%
January, February, March, And December [Member] | Maximum [Member] | Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Accounts Receivable Securitization	225,000,000
January, February, March, And December [Member] | Maximum [Member] | Accounts Receivable Securitization [Member] | Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Accounts Receivable Securitization	225,000,000.0
April And May [Member] | Maximum [Member] | Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Accounts Receivable Securitization	175,000,000
April And May [Member] | Maximum [Member] | Accounts Receivable Securitization [Member] | Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Accounts Receivable Securitization	175,000,000.0
All Other Months [Member] | Maximum [Member] | Accounts Receivable Securitization [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Accounts Receivable Securitization	145,000,000
All Other Months [Member] | Maximum [Member] | Accounts Receivable Securitization [Member] | Ferrellgas, L.P. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Accounts Receivable Securitization	$ 145,000,000.0