Debt (Components Of Long-Term Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Schedule of Capitalization, Long-term Debt [Line Items]
Total long-term debt	$ 2,021,338	$ 1,968,431
Unamortized Debt Issuance Expense	(22,965)	(23,175)
Less: current portion, included in other current liabilities on the consolidated balance sheets	2,578	3,921
Long-term debt	1,995,795	1,941,335
Ferrellgas, L.P. [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Total long-term debt	1,670,314	1,786,431
Unamortized Debt Issuance Expense	(18,466)	(21,629)
Less: current portion, included in other current liabilities on the consolidated balance sheets	2,578	3,921
Long-term debt	1,649,270	1,760,881
Fixed Rate Six Point Seven Five Due Two Thousand Twenty Three [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Senior notes	$ 500,000	500,000
Debt instrument, maturity year	2023
Fixed Rate Six Point Seven Five Due Two Thousand Twenty Three [Member] | Ferrellgas, L.P. [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Senior notes	$ 500,000	500,000
Debt instrument, maturity year	2023
Fixed Rate Six Point Five Zero Due Two Thousand Twenty One [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Senior notes	$ 500,000	500,000
Debt instrument, maturity year	2021
Fixed Rate Six Point Five Zero Due Two Thousand Twenty One [Member] | Ferrellgas, L.P. [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Senior notes	$ 500,000	500,000
Debt instrument, maturity year	2021
Fixed Rate Six Point Seven Five Due Two Thousand twenty Two [Domain]
Schedule of Capitalization, Long-term Debt [Line Items]
Senior notes	$ 478,166	479,008
Fixed Rate Six Point Seven Five Due Two Thousand twenty Two [Domain] | Ferrellgas, L.P. [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Senior notes	478,166	479,008
Fixed Rate Eight Point Six Two Five Due Two Thousand Twenty [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Senior notes	$ 351,024	182,000
Debt instrument, maturity year	2020
Interest Rate Swap [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Senior notes	$ 471	5,830
Interest Rate Swap [Member] | Ferrellgas, L.P. [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Senior notes	471	5,830
Secured Credit Facility [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility	$ 185,719	293,109
Debt instrument, maturity year	2018
Secured Credit Facility [Member] | Ferrellgas, L.P. [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility	$ 185,719	293,109
Debt instrument, maturity year	2018
Notes Payable [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Notes payable	$ 5,958	8,484
Notes Payable [Member] | Ferrellgas, L.P. [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Notes payable	$ 5,958	$ 8,484
Fixed Rate Eight Point Six Two Five Due Two Thousand Twenty [Member] | Ferrellgas, L.P. [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, maturity year	2020