Summary Of Significant Accounting Policies (Summary Of Income Tax Expense) (Details) (USD $)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Current expense	$ 215,000	$ 490,000	$ 1,477,000
Deferred expense	913,000	751,000	439,000
Income tax expense	1,128,000	1,241,000	1,916,000
Ferrellgas, L.P. [Member]
Current expense	207,000	474,000	1,451,000
Deferred expense	913,000	751,000	439,000
Income tax expense	$ 1,120,000	$ 1,225,000	$ 1,890,000