Summary Of Significant Accounting Policies (Summary Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Significant Accounting Policies [Line Items]
Current expense	$ 180	$ 1,140	$ (1,154)
Deferred expense	143	(3,818)	11
Income tax expense	323	(2,678)	(1,143)
Ferrellgas, L.P. [Member]
Significant Accounting Policies [Line Items]
Current expense	150	1,119	(1,160)
Deferred expense	143	(3,818)	11
Income tax expense	$ 293	$ (2,699)	$ (1,149)