Derivative Instruments and Hedging Activities (Fair Value of Financial Derivatives Balance Sheet Locations) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jul. 31, 2014
Derivatives, Fair Value [Line Items]
Propane commodity derivative assets	$ 1,278	$ 7,006
Interest rate swap assets	2,138	2,101
Derivative assets, fair value	3,416	9,107
Propane commodity derivative liabilities	8,241	83
Interest rate swap liabilities	4,847	5,075
Derivative liabilities, fair value	13,088	5,158
Ferrellgas, L.P. [Member]
Derivatives, Fair Value [Line Items]
Propane commodity derivative assets	1,278	7,006
Interest rate swap assets	2,138	2,101
Derivative assets, fair value	3,416	9,107
Propane commodity derivative liabilities	8,241	83
Interest rate swap liabilities	4,847	5,075
Derivative liabilities, fair value	13,088	5,158
Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Propane commodity derivative assets	1,042	5,301
Interest rate swap assets	2,138	2,101
Prepaid Expenses and Other Current Assets [Member] | Ferrellgas, L.P. [Member]
Derivatives, Fair Value [Line Items]
Propane commodity derivative assets	1,042	5,301
Interest rate swap assets	2,138	2,101
Other assets, net [Member]
Derivatives, Fair Value [Line Items]
Propane commodity derivative assets	236	1,705
Interest rate swap assets	0	0
Other assets, net [Member] | Ferrellgas, L.P. [Member]
Derivatives, Fair Value [Line Items]
Propane commodity derivative assets	236	1,705
Interest rate swap assets	0	0
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Propane commodity derivative liabilities	6,229	83
Interest rate swap liabilities	407	0
Other Current Liabilities [Member] | Ferrellgas, L.P. [Member]
Derivatives, Fair Value [Line Items]
Propane commodity derivative liabilities	6,229	83
Interest rate swap liabilities	407	0
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Propane commodity derivative liabilities	2,012	0
Interest rate swap liabilities	4,440	5,075
Other Liabilities [Member] | Ferrellgas, L.P. [Member]
Derivatives, Fair Value [Line Items]
Propane commodity derivative liabilities	2,012	0
Interest rate swap liabilities	$ 4,440	$ 5,075