Transactions With Related Parties (Schedule Of Transactions With Related Parties) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Related Party Transaction [Line Items]
General and administrative expense	$ 14,891	$ 12,279	$ 28,055	$ 26,548
Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
General and administrative expense	14,890	12,278	28,054	26,547
Compensation And Benefits [Member]
Related Party Transaction [Line Items]
Operating expense	65,291	61,492	122,642	117,206
General and administrative expense	8,422	8,217	15,930	16,800
Compensation And Benefits [Member] | Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
Operating expense	65,291	61,492	122,642	117,206
General and administrative expense	$ 8,422	$ 8,217	$ 15,930	$ 16,800