Transactions With Related Parties (Allocation Of Transactions With Related Parties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Related Party Transaction [Line Items]
General and administrative expense	$ 49,617	$ 56,635	$ 77,238
Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
General and administrative expense	49,478	56,115	77,238
Compensation And Benefits [Member]
Related Party Transaction [Line Items]
Operating expense	228,969	230,437	217,742
General and administrative expense	31,068	30,239	27,278
Compensation And Benefits [Member] | Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
Operating expense	228,969	230,437	217,742
General and administrative expense	$ 31,068	$ 30,239	$ 27,278