Transactions With Related Parties (Allocation Of Transactions With Related Parties) (Details) (USD $)	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Related Party Transaction [Line Items]
General and administrative expense	$ 11,155,000	$ 11,114,000
Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
General and administrative expense	11,155,000	11,114,000
Compensation And Benefits [Member]
Related Party Transaction [Line Items]
Operating expense	47,784,000	49,347,000
General and administrative expense	6,273,000	6,017,000
Compensation And Benefits [Member] | Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
Operating expense	47,784,000	49,347,000
General and administrative expense	$ 6,273,000	$ 6,017,000