Partnership Organization And Formation (Details)	3 Months Ended
	Oct. 31, 2012 state item customer employee
Partnership Organization And Formation [Line Items]
Approximate number of customers in 50 states	1,000,000
Number of subsidiaries	2
Number of states in which operating partnership serves	50
Limited partner interest	99.00%
General partner interest in Ferrellgas Partners	1.00%
General partner interest in the operating partnership	1.00%
General partner interest in Ferrellgas on a combined basis	2.00%
Equity interest in subsidiary	100.00%
Number of employees	0
Ferrellgas Partners Finance Corp. [Member]
Partnership Organization And Formation [Line Items]
Common stock shares outstanding	1,000
Number of employees	0
Ferrellgas, L.P. [Member]
Partnership Organization And Formation [Line Items]
Approximate number of customers in 50 states	1,000,000
Number of states in which operating partnership serves	50
Limited partner interest	99.00%
General partner interest in the operating partnership	1.00%
Equity interest in subsidiary	100.00%
Number of employees	0
Ferrellgas Finance Corp. [Member]
Partnership Organization And Formation [Line Items]
Common stock shares outstanding	1,000
Number of employees	0
Ferrell Companies [Member]
Partnership Organization And Formation [Line Items]
Subsidiary Or Equity Method Investee Cumulative Percentage Ownership After All Transactions And Including Beneficial Ownership	27.00%
Common stock shares outstanding	21,700,000