Supplemental Financial Statement Information (Loss On Disposal Of Assets And Other) (Details) (USD $) In Thousands	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Loss on disposal of assets	$ 3,633	$ 7,296	$ 5,009
Loss on transfer of accounts receivable related to the accounts receivable securitization		6,566	12,124
Service income related to the accounts receivable securitization		(5,377)	(4,091)
Loss on disposal of assets and other	3,633	8,485	13,042
Ferrellgas, L.P. And Subsidiaries [Member]
Loss on disposal of assets	3,633	7,296	5,009
Loss on transfer of accounts receivable related to the accounts receivable securitization		6,566	12,124
Service income related to the accounts receivable securitization		(5,377)	(4,091)
Loss on disposal of assets and other	$ 3,633	$ 8,485	$ 13,042