Transactions With Related Parties (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Number of employees	0
Payments received for services provided			$ 0.3
Marketing and communications services	0.1	0.2	0.2
Ferrellgas, L.P. And Subsidiaries [Member]
Number of employees	0
Payments received for services provided			0.3
Marketing and communications services	$ 0.1	$ 0.2	$ 0.2