Supplemental Financial Statement Information - Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Supplemental Financial Statement Information [Line Items]
Interest paid (refunded)	$ 166,897	$ 159,271	$ 143,441
Income taxes paid (refunded)	141	(291)	310
Noncash Investing and Financing Items [Abstract]
Liabilities incurred in connection with acquisitions	1,650	1,993	139
Change in accruals for property, plant and equipment additions	1,132	264	164
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Interest paid (refunded)	136,106	128,479	122,084
Income taxes paid (refunded)	111	(311)	305
Noncash Investing and Financing Items [Abstract]
Liabilities incurred in connection with acquisitions	1,650	1,993	139
Change in accruals for property, plant and equipment additions	$ 1,132	$ 264	$ 164