Supplemental Financial Statement Information Supplemental financial statement information (Significant Cash and Non-Cash Activities) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Interest Paid	$ 78,682	$ 69,572
Income Taxes Paid	12	26
Noncash Investing and Financing Items [Abstract]
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	1,508	0
Property, Plant and Equipment, Additions	47	(100)
Ferrellgas, L.P. [Member]
Interest Paid	63,286	61,723
Income Taxes Paid	1	25
Noncash Investing and Financing Items [Abstract]
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	1,508	0
Property, Plant and Equipment, Additions	$ 47	$ (100)