Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $)	9 Months Ended
	Apr. 30, 2015 MMBbls	Apr. 30, 2014
Reclassification of net gain to earnings during next 12 months	$ 19,200,000
Number of barrels of propane covered by cash flow hedges	3,200,000
Derivative amount of credit risk	1,500,000
Derivative net liability position aggregate fair value	400,000.0
Collateral already posted	0
Gain or loss in earnings related to hedge ineffectiveness	200,000	0
Reclassification of gain (loss) to earnings from discontinuance of cash flow hedges	0	0
Ferrellgas, L.P. [Member]
Reclassification of net gain to earnings during next 12 months	19,200,000
Number of barrels of propane covered by cash flow hedges	3,200,000
Derivative amount of credit risk	1,500,000
Derivative net liability position aggregate fair value	400,000
Collateral already posted	0
Gain or loss in earnings related to hedge ineffectiveness	200,000	0
Reclassification of gain (loss) to earnings from discontinuance of cash flow hedges	$ 0	$ 0