Supplemental Financial Statement Information Supplemental financial statement information (Significant Cash and Non-Cash Activities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Interest Paid	$ 5,631	$ 3,780
Noncash Investing and Financing Items [Abstract]
Property, Plant and Equipment, Additions	(189)	1,727
Ferrellgas, L.P. [Member]
Interest Paid	5,630	3,779
Noncash Investing and Financing Items [Abstract]
Property, Plant and Equipment, Additions	(189)	1,727
Common Unitholders [Member] | Assets [Member] | Ferrellgas, L.P. [Member]
Noncash Investing and Financing Items [Abstract]
Partners' Capital Account, Acquisitions	$ 0	$ (284)