Fair Value Measurements (Assets And Liabilities Fair Value Hierarchy) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jul. 31, 2013
Interest rate swap assets	$ 2,171	$ 3,783
Propane commodity derivative assets	14,333	2,532
Interest rate swap liabilities	(6,003)	(4,998)
Propane commodity derivative liabilities		(907)
Ferrellgas, L.P. [Member]
Interest rate swap assets	2,171	3,783
Propane commodity derivative assets	14,333	2,532
Interest rate swap liabilities	(6,003)	(4,998)
Propane commodity derivative liabilities		(907)
Level 1 [Member]
Interest rate swap assets
Propane commodity derivative assets
Interest rate swap liabilities
Propane commodity derivative liabilities
Level 1 [Member] | Ferrellgas, L.P. [Member]
Interest rate swap assets
Propane commodity derivative assets
Interest rate swap liabilities
Propane commodity derivative liabilities
Level 2 [Member]
Interest rate swap assets	2,171	3,783
Propane commodity derivative assets	14,333	2,532
Interest rate swap liabilities	(6,003)	(4,998)
Propane commodity derivative liabilities		(907)
Level 2 [Member] | Ferrellgas, L.P. [Member]
Interest rate swap assets	2,171	3,783
Propane commodity derivative assets	14,333	2,532
Interest rate swap liabilities	(6,003)	(4,998)
Propane commodity derivative liabilities		(907)
Level 3 [Member]
Interest rate swap assets
Propane commodity derivative assets
Interest rate swap liabilities
Propane commodity derivative liabilities
Level 3 [Member] | Ferrellgas, L.P. [Member]
Interest rate swap assets
Propane commodity derivative assets
Interest rate swap liabilities
Propane commodity derivative liabilities