Segment Reporting Segment Reporting (Schedule of Capital Expenditure Information, by Segment) (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Segment Reporting Information
Capital Expenditures	$ 31,925	$ 105,057
Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	29,779	41,166
Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	241	62,900
Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	1,905	991
Maintenance Capital Expenditures [Member]
Segment Reporting Information
Capital Expenditures	10,679	13,728
Maintenance Capital Expenditures [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	8,533	12,705
Maintenance Capital Expenditures [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	241	32
Maintenance Capital Expenditures [Member] | Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	1,905	991
Growth Capital Expenditures [Member]
Segment Reporting Information
Capital Expenditures	21,246	91,329
Growth Capital Expenditures [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	21,246	28,461
Growth Capital Expenditures [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	0	62,868
Growth Capital Expenditures [Member] | Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	0	0
Ferrellgas, L.P. [Member]
Segment Reporting Information
Capital Expenditures	31,925	105,057
Ferrellgas, L.P. [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	29,779	41,166
Ferrellgas, L.P. [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	241	62,900
Ferrellgas, L.P. [Member] | Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	1,905	991
Ferrellgas, L.P. [Member] | Maintenance Capital Expenditures [Member]
Segment Reporting Information
Capital Expenditures	10,679	13,728
Ferrellgas, L.P. [Member] | Maintenance Capital Expenditures [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	8,533	12,705
Ferrellgas, L.P. [Member] | Maintenance Capital Expenditures [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	241	32
Ferrellgas, L.P. [Member] | Maintenance Capital Expenditures [Member] | Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	1,905	991
Ferrellgas, L.P. [Member] | Growth Capital Expenditures [Member]
Segment Reporting Information
Capital Expenditures	21,246	91,329
Ferrellgas, L.P. [Member] | Growth Capital Expenditures [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	21,246	28,461
Ferrellgas, L.P. [Member] | Growth Capital Expenditures [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	0	62,868
Ferrellgas, L.P. [Member] | Growth Capital Expenditures [Member] | Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	$ 0	$ 0