Transactions With Related Parties (Schedule Of Transactions With Related Parties) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Related Party Transaction [Line Items]
General and administrative expense	$ 11,678	$ 9,978	$ 39,733	$ 36,526
Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
General and administrative expense	11,546	9,869	39,600	36,416
Compensation And Benefits [Member]
Related Party Transaction [Line Items]
Operating expense	58,842	53,747	181,484	170,953
General and administrative expense	5,707	6,913	21,637	23,713
Compensation And Benefits [Member] | Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
Operating expense	58,842	53,747	181,484	170,953
General and administrative expense	$ 5,707	$ 6,913	$ 21,637	$ 23,713