Fair Value Measurements - Other Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$ 1,327,800	$ 1,466,400
Gain (loss) on extinguishment of debt	$ 0	(104,834)	$ (37,399)
Ferrellgas, L.P. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on extinguishment of debt		$ (107,971)	$ (37,399)