Supplemental Financial Statement Information (Other Current Liabilities) (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Jul. 31, 2017
Accrued interest	$ 51,109	$ 18,671
Customer deposits and advances	42,599	25,541
Other	107,171	82,012
Other current liabilities	200,879	126,224
Ferrellgas, L.P. [Member]
Accrued interest	39,477	14,737
Customer deposits and advances	42,599	25,541
Other	107,185	81,738
Other current liabilities	$ 189,261	$ 122,016