Transactions With Related Parties (Schedule Of Transactions With Related Parties) (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Related Party Transaction [Line Items]
General and administrative expense	$ 14,269	$ 19,144
Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
General and administrative expense	14,269	19,144
Compensation And Benefits [Member]
Related Party Transaction [Line Items]
Operating expense	55,714	56,010
General and administrative expense	8,583	7,093
Compensation And Benefits [Member] | Ferrellgas, L.P. [Member]
Related Party Transaction [Line Items]
Operating expense	55,714	56,010
General and administrative expense	$ 8,583	$ 7,093