Segment Reporting Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Segment Reporting Information
Revenues	$ 454,655	$ 379,542
Costs and Expenses	428,439	350,523
Adjusted EBITDA	26,216	29,019
Propane and related equipment sales [Member]
Segment Reporting Information
Revenues	333,895	271,498
Costs and Expenses	303,329	237,014
Adjusted EBITDA	30,566	34,484
Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Revenues	120,760	108,044
Costs and Expenses	113,901	102,773
Adjusted EBITDA	6,859	5,271
Corporate and Other [Member]
Segment Reporting Information
Revenues	0	0
Costs and Expenses	11,209	10,736
Adjusted EBITDA	(11,209)	(10,736)
Ferrellgas, L.P. [Member]
Segment Reporting Information
Revenues	454,655	379,542
Costs and Expenses	428,439	350,523
Adjusted EBITDA	26,216	29,019
Ferrellgas, L.P. [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Revenues	333,895	271,498
Costs and Expenses	303,329	237,014
Adjusted EBITDA	30,566	34,484
Ferrellgas, L.P. [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Revenues	120,760	108,044
Costs and Expenses	113,901	102,773
Adjusted EBITDA	6,859	5,271
Ferrellgas, L.P. [Member] | Corporate and Other [Member]
Segment Reporting Information
Revenues	0	0
Costs and Expenses	11,209	10,736
Adjusted EBITDA	$ (11,209)	$ (10,736)