Supplemental Information - Cash (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	$ 202,618		$ 238,002
Restricted cash	96,909		95,759
Cash pledged as collateral for letters of credit	79,400		78,200
Cash deposit against contingencies	11,500		11,500
Additional pledged collateral	6,000		6,100
Cash and cash equivalents and restricted cash	299,527	$ 29,805	333,761	$ 11,054
Cash paid for interest	36,997	8,284
Income taxes	35
Noncash Investing and Financing Items [Abstract]
Liabilities incurred in connection with acquisitions		520
Change in accruals for property, plant and equipment additions	(65)	(43)
Lease liabilities arising from operating right-of-use assets	366	11,563
Lease liabilities arising from finance right-of-use assets	554	5,614
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Cash and cash equivalents	202,613		237,996
Restricted cash	96,909		95,759
Cash pledged as collateral for letters of credit	79,400		78,200
Cash deposit against contingencies	11,500		11,500
Additional pledged collateral	6,000		6,100
Cash and cash equivalents and restricted cash	299,522	29,733	$ 333,755	$ 11,046
Cash paid for interest	36,997	8,284
Income taxes	35
Noncash Investing and Financing Items [Abstract]
Liabilities incurred in connection with acquisitions		520
Change in accruals for property, plant and equipment additions	(65)	(43)
Lease liabilities arising from operating right-of-use assets	366	11,563
Lease liabilities arising from finance right-of-use assets	$ 554	$ 5,614