Fair Value Measurements Fair Value Measurements (Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended				3 Months Ended
	Oct. 31, 2014	Jul. 31, 2014	Oct. 31, 2014 Accretion [Member]	Oct. 31, 2014 Fair Value Change due to Unobservable Inputs [Member]	Oct. 31, 2014 Ferrellgas, L.P. [Member]	Jul. 31, 2014 Ferrellgas, L.P. [Member]	Oct. 31, 2014 Ferrellgas, L.P. [Member] Accretion [Member]	Oct. 31, 2014 Ferrellgas, L.P. [Member] Fair Value Change due to Unobservable Inputs [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	$ 4,600	$ 6,400			$ 4,600	$ 6,400
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings			$ (200)	$ 2,000			$ 200	$ (2,000)