Supplemental Information - Cash (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Jul. 31, 2019	Jul. 31, 2018
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	$ 177,529		$ 11,054
Restricted Cash and Cash Equivalents, Total	141,318
Cash pledged as collateral for letters of credit	123,800
Cash deposit against contingencies	11,500
Additional pledged collateral	6,000
Cash and cash equivalents and restricted cash	318,847	$ 45,434	11,054	$ 119,311
Cash paid for interest	96,418	93,465
Income taxes	50	21
Noncash Investing and Financing Items [Abstract]
Liability incurred in connection with Term Loan amendment	8,863
Liabilities incurred in connection with acquisitions		1,174
Change in accruals for property, plant and equipment additions	486	1,202
Right-of-use assets arising from operating and finance lease liabilities	42,042
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	177,519		11,046
Restricted Cash and Cash Equivalents, Total	141,318
Cash pledged as collateral for letters of credit	123,800
Cash deposit against contingencies	11,500
Additional pledged collateral	6,000
Cash and cash equivalents and restricted cash	318,837	45,365	$ 11,046	$ 119,308
Cash paid for interest	81,023	78,069
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		1,174
Change in accruals for property, plant and equipment additions	486	$ 1,202
Right-of-use assets arising from operating and finance lease liabilities	$ 42,042