Schedule II Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands					3 Months Ended	12 Months Ended
	Feb. 01, 2021	Jan. 27, 2021	Jul. 01, 2020	Jun. 25, 2018	Jan. 31, 2021	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Jamex Marketing LLC [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Note receivable, original principal amount		$ 2,500		$ 18,300
Notes receivable, payment due	$ 1,500	1,500	$ 2,500
Notes receivable, amount reserved						$ 2,500		$ 17,300
Notes receivable, current								12,500
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period						17,256	$ 14,124	2,463
Charged to cost and expenses						1,847	2,323	2,279
Other						(12,411)	809	9,382
Balance at end of period						6,692	17,256	14,124
Allowance For Doubtful Accounts [Member] | Jamex Marketing LLC [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Other					$ (500)
Ferrellgas, L.P. [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Note receivable, original principal amount							14,810
Ferrellgas, L.P. [Member] | Jamex Marketing LLC [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Note receivable, original principal amount		2,500		$ 18,300
Notes receivable, payment due	$ 1,500	$ 1,500	$ 2,500
Notes receivable, amount reserved						2,500		17,300
Notes receivable, current								12,500
Ferrellgas, L.P. [Member] | Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period						17,256	14,124	2,463
Charged to cost and expenses						1,847	2,323	2,279
Other						(12,411)	809	9,382
Balance at end of period						$ 6,692	$ 17,256	$ 14,124
Ferrellgas, L.P. [Member] | Allowance For Doubtful Accounts [Member] | Jamex Marketing LLC [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Other					$ (500)