Segment Reporting Segment Reporting (Reconciliation of Assets from Segment to Consolidated) (Details) (USD $)	Apr. 30, 2015	Jul. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 1,592,857,000	$ 1,572,270,000
Propane and related equipment sales [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,356,809,000	1,400,603,000
Midstream Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	199,593,000	136,116,000
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	36,455,000	35,551,000
Ferrellgas, L.P. [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,590,660,000	1,569,833,000
Ferrellgas, L.P. [Member] | Propane and related equipment sales [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,356,809,000	1,400,603,000
Ferrellgas, L.P. [Member] | Midstream Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	199,593,000	136,116,000
Ferrellgas, L.P. [Member] | Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 34,258,000	$ 33,114,000