Debt - Components Of Long-Term Debt (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Jul. 31, 2021	Mar. 30, 2021
Schedule of Capitalization, Long-term Debt [Line Items]
Total long-term debt	$ 1,479,719	$ 1,478,882
Unamortized debt issuance and other costs	(28,910)	(32,322)
Less: current portion of long-term debt	1,979	1,670
Long-term debt	$ 1,448,830	1,444,890
Fixed Rate Six Point Five Zero Due Two Thousand Twenty One [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest rate, as a percent	6.50%		6.50%
Fixed Rate Six Point Seven Five Due Two Thousand Twenty Three [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest rate, as a percent	6.75%		6.75%
Fixed Rate Six Point Seven Five Due Two Thousand twenty Two [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest rate, as a percent	6.75%		6.75%
Fixed Rate Eight Point Six Two Five Due Two Thousand Twenty [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest rate, as a percent			8.625%
Senior Notes 5.375 Percent Due 2026 [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 650,000	650,000
Interest rate, as a percent	5.375%		5.375%
Senior Notes 5.875 Percent Due 2029 [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 825,000	825,000
Interest rate, as a percent	5.875%		5.875%
Fixed rate 10.00% Due 2025
Schedule of Capitalization, Long-term Debt [Line Items]
Interest rate, as a percent	10.00%		10.00%
Notes payable Due 2022 to 2029
Schedule of Capitalization, Long-term Debt [Line Items]
Notes payable	$ 4,719	3,882
Unamortized discount	$ 497	$ 573
Debt, Weighted Average Interest Rate	9.00%	8.80%
Ferrellgas, L.P. [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Total long-term debt	$ 1,479,719	$ 1,478,882
Unamortized debt issuance and other costs	(28,910)	(32,322)
Less: current portion of long-term debt	1,979	1,670
Long-term debt	1,448,830	1,444,890
Ferrellgas, L.P. [Member] | Senior Notes 5.375 Percent Due 2026 [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 650,000	650,000
Interest rate, as a percent	5.375%
Ferrellgas, L.P. [Member] | Senior Notes 5.875 Percent Due 2029 [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 825,000	825,000
Interest rate, as a percent	5.875%
Ferrellgas, L.P. [Member] | Notes payable Due 2022 to 2029
Schedule of Capitalization, Long-term Debt [Line Items]
Notes payable	$ 4,719	3,882
Unamortized discount	$ 497	$ 573
Debt, Weighted Average Interest Rate	9.00%	8.80%