Income Taxes (Details) (USD $)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Deferred tax expense (benefit)	$ 913,000	$ 751,000	$ 439,000
Deferred tax asset	1,158,000	992,000
Ferrellgas Partners Finance Corp. [Member]
Deferred Tax Assets, Operating Loss Carryforwards	4,270
Net operating loss carryforward	10,977
Net operating loss carryforward, expiration date	July 31, 2032
Valuation allowance provided for deferred tax asset	4,270
Deferred tax expense (benefit)	0	0	0
Deferred tax asset	0	0
Ferrellgas Finance Corp. [Member]
Deferred Tax Assets, Operating Loss Carryforwards	15,101
Net operating loss carryforward	38,821
Net operating loss carryforward, expiration date	July 31, 2032
Valuation allowance provided for deferred tax asset	15,101
Deferred tax expense (benefit)	0	0	0
Deferred tax asset	$ 0	$ 0