Debt (Senior Notes Narrative) (Details) (USD $)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Interest Paid	$ 90,820,000	$ 84,030,000	$ 88,696,000
Ferrellgas, L.P. [Member]
Interest Paid	75,121,000	68,334,000	72,999,000
Fixed Rate Six Point Seven Five Due Two Thousand twenty Two [Domain]
Senior note, issuance date	Nov. 04, 2013
Debt instrument, face amount	325,000,000
Interest rate	6.75%
Proceeds from issuance of unsecured debt	319,300,000
Debt Instrument, Maturity Date	Nov. 01, 2022
Debt issued premium, percent of par	104.00%
Fixed Rate Six Point Seven Five Due Two Thousand twenty Two [Domain] | Ferrellgas, L.P. [Member]
Senior note, issuance date	Nov. 04, 2013
Debt instrument, face amount	325,000,000
Interest rate	6.75%
Proceeds from issuance of unsecured debt	319,300,000
Debt Instrument, Maturity Date	Nov. 01, 2022
Debt issued premium, percent of par	104.00%
Fixed Rate Six Point Five Zero Due Two Thousand Twenty One [Member]
Senior note, issuance date	Nov. 06, 2010
Debt instrument, face amount	500,000,000.0
Interest rate	6.50%
Debt Instrument, Frequency of Periodic Payment	semi-annually
Debt Instrument, Maturity Date	May 01, 2021
Debt instrument prepayment penalty prior to date	2019
Fixed Rate Six Point Five Zero Due Two Thousand Twenty One [Member] | Ferrellgas, L.P. [Member]
Senior note, issuance date	Nov. 06, 2010
Debt instrument, face amount	500,000,000.0
Interest rate	6.50%
Debt Instrument, Frequency of Periodic Payment	semi-annually
Debt Instrument, Maturity Date	May 01, 2021
Debt instrument prepayment penalty prior to date	2019
Fixed Rate Nine Point One Two Five Percentage Due Two Thousand Seventeen [Member]
Senior note, issuance date	Jun. 06, 2014
Debt instrument, face amount	150,000,000
Interest rate	9.125%
Debt Instrument, Maturity Date	Oct. 01, 2017
Write-offs of unamortized discount on debt	6,000,000
Debt Instrument, Repurchased Face Amount	300,000,000
Payments of Debt Extinguishment Costs	14,700,000
Interest Paid	3,300,000
Fixed Rate Nine Point One Two Five Percentage Due Two Thousand Seventeen [Member] | Ferrellgas, L.P. [Member]
Senior note, issuance date	Jun. 06, 2014
Debt instrument, face amount	150,000,000
Interest rate	9.125%
Debt Instrument, Maturity Date	Oct. 01, 2017
Write-offs of unamortized discount on debt	6,000,000
Debt Instrument, Repurchased Face Amount	300,000,000
Payments of Debt Extinguishment Costs	14,700,000
Interest Paid	3,300,000
Fixed Rate Eight Point Six Two Five Due Two Thousand Twenty [Member]
Senior note, issuance date	Apr. 13, 2010
Debt instrument, face amount	280,000,000.0
Debt Instrument, Principal Amount Redeemed	$ 98,000,000
Debt Instrument, Frequency of Periodic Payment	semi-annually
Debt instrument prepayment penalty prior to date	2018