Transactions With Related Parties (Allocation Of Transactions With Related Parties) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Related Party Transaction [Line Items]
General and administrative expense	$ 12,717,000	$ 11,236,000	$ 23,872,000	$ 22,350,000
Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
General and administrative expense	12,717,000	11,236,000	23,872,000	22,350,000
Compensation And Benefits [Member]
Related Party Transaction [Line Items]
Operating expense	53,594,000	53,964,000	101,378,000	103,311,000
General and administrative expense	7,183,000	6,689,000	13,456,000	12,706,000
Compensation And Benefits [Member] | Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
Operating expense	53,594,000	53,964,000	101,378,000	103,311,000
General and administrative expense	$ 7,183,000	$ 6,689,000	$ 13,456,000	$ 12,706,000