Goodwill And Intangible Assets, Net (Aggregate Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Aggregate amortization expense	$ 32,148	$ 61,970	$ 34,585
Ferrellgas, L.P. [Member]
Aggregate amortization expense	$ 32,148	$ 61,970	$ 34,585