Supplemental Information - Cash (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	$ 238,002	$ 11,054
Restricted cash	95,759
Cash pledged as collateral for letters of credit	78,200
Cash deposit against contingencies	11,500
Additional pledged collateral	6,100
Cash and cash equivalents and restricted cash	333,761	11,054	$ 119,311	$ 5,760
Cash paid for interest	147,402	166,897	159,271
Income taxes	289	141	(291)
Noncash Investing and Financing Items [Abstract]
Liability incurred in connection with Term Loan amendment	8,863
Liabilities incurred in connection with acquisitions	975	1,650	1,993
Change in accruals for property, plant and equipment additions	216	1,132	264
Lease liabilities arising from operating right-of-use assets	14,938
Lease liabilities arising from finance right-of-use assets	45,455
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	237,996	11,046
Restricted cash	95,759
Cash pledged as collateral for letters of credit	78,200
Cash deposit against contingencies	11,500
Additional pledged collateral	6,100
Cash and cash equivalents and restricted cash	333,755	11,046	119,308	$ 5,701
Cash paid for interest	132,006	136,106	128,479
Income taxes	241	111	(311)
Noncash Investing and Financing Items [Abstract]
Liability incurred in connection with Term Loan amendment	8,863
Liabilities incurred in connection with acquisitions	975	1,650	1,993
Change in accruals for property, plant and equipment additions	216	$ 1,132	$ 264
Lease liabilities arising from operating right-of-use assets	14,938
Lease liabilities arising from finance right-of-use assets	$ 45,455