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Subsequent events (Details) - USD ($) $ in Millions		1 Months Ended	9 Months Ended
Subsequent events (Details) - USD ($) $ in Millions	May 16, 2022	Jul. 31, 2021	Apr. 30, 2022
Related Party Term Loan Credit Agreement [Member] \| Ferrellgas, L.P. [Member]
Subsequent Event [Line Items]
Repayments of Notes Payable		$ 9.0
Related Party Term Loan Credit Agreement [Member] \| Ferrellgas, L.P. [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Repayments of Notes Payable	$ 15.3
Ferrellgas Partners Finance Corp. [Member]
Subsequent Event [Line Items]
events or transactions			no