Supplemental Financial Statement Information - Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Supplemental Financial Statement Information [Line Items]
Cash paid for interest	$ 83,826	$ 82,941
Income taxes	1	(2)
Noncash Investing and Financing Items [Abstract]
Liability incurred in connection with Term Loan amendment	8,863
Liabilities incurred in connection with acquisitions	520	1,174
Change in accruals for property, plant and equipment additions	268	2,815
Right-of-use assets arising from operating and finance lease liabilities	33,847
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Cash paid for interest	68,430	67,546
Income taxes	1	9
Noncash Investing and Financing Items [Abstract]
Liability incurred in connection with Term Loan amendment	8,863
Liabilities incurred in connection with acquisitions	520	1,174
Change in accruals for property, plant and equipment additions	268	$ 2,815
Right-of-use assets arising from operating and finance lease liabilities	$ 33,847