Summary Of Significant Accounting Policies (Summary Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Current expense	$ (1,154)	$ 468	$ (585)
Deferred expense	11	(504)	270
Income tax expense	(1,143)	(36)	(315)
Ferrellgas, L.P. [Member]
Current expense	(1,160)	463	(654)
Deferred expense	11	(504)	270
Income tax expense	$ (1,149)	$ (41)	$ (384)