Fair Value Measurements (Assets And Liabilities Fair Value Hierarchy) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012
Interest rate swap assets	$ 3,783	$ 7,784
Commodity derivatives propane swap assets	2,532	1,049
Interest rate swap liabilities	(4,998)	(1,778)
Commodity derivatives propane swap liabilities	(907)	(12,069)
Ferrellgas, L.P. [Member]
Interest rate swap assets	3,783	7,784
Commodity derivatives propane swap assets	2,532	1,049
Interest rate swap liabilities	(4,998)	(1,778)
Commodity derivatives propane swap liabilities	(907)	(12,069)
Level 2 [Member]
Interest rate swap assets	3,783	7,784
Commodity derivatives propane swap assets	2,532	1,049
Interest rate swap liabilities	(4,998)	(1,778)
Commodity derivatives propane swap liabilities	(907)	(12,069)
Level 2 [Member] | Ferrellgas, L.P. [Member]
Interest rate swap assets	3,783	7,784
Commodity derivatives propane swap assets	2,532	1,049
Interest rate swap liabilities	(4,998)	(1,778)
Commodity derivatives propane swap liabilities	$ (907)	$ (12,069)