Debt - Components Of Long-Term Debt (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Jun. 07, 2020	Apr. 30, 2020	Apr. 16, 2020	Jul. 31, 2019	Jan. 31, 2017	Jun. 30, 2015	Jul. 31, 2014	Nov. 30, 2010
Schedule of Capitalization, Long-term Debt [Line Items]
Total long-term debt	$ 2,541,074				$ 2,113,276
Unamortized debt issuance expense	35,583				24,516
Less: current portion of long-term debt	859,095				631,756
Long-term debt	1,646,396				1,457,004
Fixed Rate Six Point Five Zero Due Two Thousand Twenty One [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 500,000				$ 500,000
Interest rate, as a percent	6.50%				6.50%				6.50%
Fixed Rate Six Point Seven Five Due Two Thousand Twenty Three [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 500,000				$ 500,000
Interest rate, as a percent	6.75%				6.75%		6.75%
Fixed Rate Six Point Seven Five Due Two Thousand twenty Two [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 475,937				$ 476,633
Interest rate, as a percent	6.75%				6.75%			6.75%
Unamortized premium	$ 937				$ 1,633
Fixed Rate Eight Point Six Two Five Due Two Thousand Twenty [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 357,000				$ 355,681
Interest rate, as a percent	8.625%	8.625%			8.625%	8.625%
Unamortized discount	$ 0				$ 1,319
Fixed rate 10.00% Due 2025
Schedule of Capitalization, Long-term Debt [Line Items]
Senior secured debt	$ 703,573
Interest rate, as a percent	10.00%		10.00%	10.00%
Unamortized premium	$ 3,573
Two Thousand and Twenty Three Term Loan [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Senior secured debt					275,000
Notes payable Due 2020 to 2029
Schedule of Capitalization, Long-term Debt [Line Items]
Notes payable	4,564				5,962
Unamortized discount	$ 537				$ 711
Debt, Weighted Average Interest Rate	9.40%				10.70%
Ferrellgas, L.P. [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Total long-term debt	$ 2,184,074				$ 1,757,595
Unamortized debt issuance expense	35,583				23,562
Less: current portion of long-term debt	502,095				277,029
Long-term debt	1,646,396				1,457,004
Ferrellgas, L.P. [Member] | Fixed Rate Six Point Five Zero Due Two Thousand Twenty One [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 500,000				500,000
Interest rate, as a percent	6.50%								6.50%
Ferrellgas, L.P. [Member] | Fixed Rate Six Point Seven Five Due Two Thousand Twenty Three [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 500,000				500,000
Interest rate, as a percent	6.75%						6.75%
Ferrellgas, L.P. [Member] | Fixed Rate Six Point Seven Five Due Two Thousand twenty Two [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 475,937				476,633
Interest rate, as a percent	6.75%							6.75%
Unamortized premium	$ 937				1,633
Ferrellgas, L.P. [Member] | Fixed Rate Eight Point Six Two Five Due Two Thousand Twenty [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Unsecured senior notes	$ 357,000
Interest rate, as a percent	8.625%	8.625%
Ferrellgas, L.P. [Member] | Fixed rate 10.00% Due 2025
Schedule of Capitalization, Long-term Debt [Line Items]
Senior secured debt	$ 703,573
Interest rate, as a percent	10.00%		10.00%	10.00%
Unamortized premium	$ 3,573
Ferrellgas, L.P. [Member] | Two Thousand and Twenty Three Term Loan [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Senior secured debt	0				275,000
Ferrellgas, L.P. [Member] | Notes payable Due 2020 to 2029
Schedule of Capitalization, Long-term Debt [Line Items]
Notes payable	4,564				5,962
Unamortized discount	$ 537				$ 711
Debt, Weighted Average Interest Rate	9.40%				10.70%