Summary Of Significant Accounting Policies (Deferred Taxes Assets And Liabilities) (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jul. 31, 2016
Deferred tax assets	$ 1,068	$ 1,156
Deferred tax liabilities	(4,186)	(4,085)
Net deferred tax liability	(3,118)	(2,929)
Ferrellgas, L.P. [Member]
Deferred tax assets	1,068	1,156
Deferred tax liabilities	(4,186)	(4,085)
Net deferred tax liability	$ (3,118)	$ (2,929)