Contingencies And Commitments (Narrative) (Details) (Senior Notes [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
	Apr. 30, 2015
Fixed Rate, 8.625%, Due 2020 [Member] | Ferrellgas Partners Finance Corp. [Member]
Debt principal amount	$ 182.0
Debt interest rate	8.625%
Debt maturity year	2020
Fixed Rate, 6.50%, Due 2021 [Member] | Ferrellgas Finance Corp. [Member]
Debt principal amount	500.0
Debt interest rate	6.50%
Debt maturity year	2021
Fixed Rate, 6.75%, Due 2022 [Member] | Ferrellgas Finance Corp. [Member]
Debt principal amount	$ 475.0
Debt interest rate	6.75%
Debt maturity year	2022