Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $)	3 Months Ended
	Oct. 31, 2014 MMBbls	Oct. 31, 2013
Reclassification of net gain to earnings during next 12 months	$ 5,200,000
Number of barrels of propane covered by cash flow hedges	2,500,000
Derivative amount of credit risk	800,000
Derivative net liability position aggregate fair value	0
Collateral already posted	0
Gain or loss in earnings related to hedge ineffectiveness	0	0
Components of financial derivative contract gains or losses excluded from the assessment of hedge effectiveness	0	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	5,200,000
Number of barrels of propane covered by cash flow hedges	2,500,000
Derivative amount of credit risk	800,000
Derivative net liability position aggregate fair value	0
Collateral already posted	0
Gain or loss in earnings related to hedge ineffectiveness	0	0
Components of financial derivative contract gains or losses excluded from the assessment of hedge effectiveness	0	0
Reclassification of gain (loss) to earnings from discontinuance of cash flow hedges	$ 0	$ 0