Supplemental Financial Statement Information (Other Current Liabilities) (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jul. 31, 2016
Accrued interest	$ 18,671	$ 16,623
Customer deposits and advances	25,541	27,391
Derivative Liability, Current	1,838	18,401
Other	80,174	66,543
Other current liabilities	126,224	128,958
Ferrellgas, L.P. [Member]
Accrued interest	14,737	14,617
Customer deposits and advances	25,541	27,391
Derivative Liability, Current	1,838	18,401
Other	79,900	66,543
Other current liabilities	$ 122,016	$ 126,952