Segment Reporting Segment Reporting (Schedule of Capital Expenditure Information, by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Segment Reporting Information
Capital Expenditures	$ 18,945	$ 8,678
Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	18,039	7,245
Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	667	127
Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	239	1,306
Maintenance Capital Expenditures [Member]
Segment Reporting Information
Capital Expenditures	8,593	3,264
Maintenance Capital Expenditures [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	8,351	1,831
Maintenance Capital Expenditures [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	3	127
Maintenance Capital Expenditures [Member] | Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	239	1,306
Growth Capital Expenditures [Member]
Segment Reporting Information
Capital Expenditures	10,352	5,414
Growth Capital Expenditures [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	9,688	5,414
Growth Capital Expenditures [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	664	0
Growth Capital Expenditures [Member] | Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	0	0
Ferrellgas, L.P. [Member]
Segment Reporting Information
Capital Expenditures	18,945	8,678
Ferrellgas, L.P. [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	18,039	7,245
Ferrellgas, L.P. [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	667	127
Ferrellgas, L.P. [Member] | Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	239	1,306
Ferrellgas, L.P. [Member] | Maintenance Capital Expenditures [Member]
Segment Reporting Information
Capital Expenditures	8,593	3,264
Ferrellgas, L.P. [Member] | Maintenance Capital Expenditures [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	8,351	1,831
Ferrellgas, L.P. [Member] | Maintenance Capital Expenditures [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	3	127
Ferrellgas, L.P. [Member] | Maintenance Capital Expenditures [Member] | Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	239	1,306
Ferrellgas, L.P. [Member] | Growth Capital Expenditures [Member]
Segment Reporting Information
Capital Expenditures	10,352	5,414
Ferrellgas, L.P. [Member] | Growth Capital Expenditures [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Capital Expenditures	9,688	5,414
Ferrellgas, L.P. [Member] | Growth Capital Expenditures [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Capital Expenditures	664	0
Ferrellgas, L.P. [Member] | Growth Capital Expenditures [Member] | Corporate and Other [Member]
Segment Reporting Information
Capital Expenditures	$ 0	$ 0