Fair Value Measurements Fair Value Measurements (Fair Value Inputs, Liabilities, Quantitative Information) (Details) (USD $)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Business Combination, Contingent Consideration, Liability	$ 6,400,000	$ 0
Fair Value Measurements, Valuation Techniques	Discounted cash flow
Weighted Average of Unobservable Input	20.00%
Minimum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Range of Unobservable Inputs	10.00%
Maximum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Range of Unobservable Inputs	70.00%
Ferrellgas, L.P. [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Business Combination, Contingent Consideration, Liability	$ 6,400,000	$ 0
Fair Value Measurements, Valuation Techniques	Discounted cash flow
Ferrellgas, L.P. [Member] | Minimum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Range of Unobservable Inputs	10.00%
Ferrellgas, L.P. [Member] | Maximum [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Range of Unobservable Inputs	70.00%