Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $)	3 Months Ended
	Oct. 31, 2013 MMBbls	Oct. 31, 2012
Derivative [Line Items]
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 net gain to earnings during next 12 months	7,900,000
Reclassification of gain (loss) to earnings from discontinuance of cash flow hedges	0	0
Number of barrels of propane covered by cash flow hedges	1,600,000
Derivative amount of credit risk	12,300,000
Derivative net liability position aggregate fair value	0
Collateral already posted	0
Ferrellgas, L.P. [Member]
Derivative [Line Items]
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 net gain to earnings during next 12 months	7,900,000
Reclassification of gain (loss) to earnings from discontinuance of cash flow hedges	0	0
Number of barrels of propane covered by cash flow hedges	1,600,000
Derivative amount of credit risk	12,300,000
Derivative net liability position aggregate fair value	0
Collateral already posted	$ 0