Debt (Short-Term Borrowings Narrative) (Details) - USD ($)	Apr. 30, 2018	Jul. 31, 2017
Short-term borrowings	$ 0	$ 59,781,000
Ferrellgas, L.P. [Member]
Short-term borrowings	0	59,781,000
Two Thousand and Eighteen Credit Facility [Member]
Short-term borrowings	0	59,800,000
Two Thousand and Eighteen Credit Facility [Member] | Ferrellgas, L.P. [Member]
Short-term borrowings	$ 0	$ 59,800,000