Summary Of Significant Accounting Policies (Narrative) (Details)	6 Months Ended
	Jan. 31, 2012
Approximate number of customers in 50 states	1,000,000
Equity interest in subsidiary	100.00%
Number of subsidiaries	2
Number of states in which operating partnership serves	50
Ferrellgas, L.P. [Member]
Approximate number of customers in 50 states	1,000,000
Equity interest in subsidiary	100.00%
Number of states in which operating partnership serves	50