Income Taxes (Details) - USD ($)	12 Months Ended			36 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2019
Income Tax Disclosure [Line Items]
Deferred income tax expense (benefit)	$ 143,000	$ (3,818,000)	$ 11,000
Deferred tax assets	631,000	$ 715,000		$ 631,000
Ferrellgas Partners Finance Corp. [Member]
Income Tax Disclosure [Line Items]
Deferred tax assets, operating loss carryforwards	6,430			6,430
Net operating loss carryforward	30,620			30,620
Deferred income tax expense (benefit)				0
Deferred tax assets	0			0
Valuation allowance provided for deferred tax asset	6,430			6,430
Ferrellgas Finance Corp. [Member]
Income Tax Disclosure [Line Items]
Deferred tax assets, operating loss carryforwards	16,163			16,163
Net operating loss carryforward	76,969			76,969
Deferred income tax expense (benefit)				0
Deferred tax assets	0			0
Valuation allowance provided for deferred tax asset	$ 16,163			$ 16,163