Goodwill And Intangible Assets, Net (Estimated Amortization Expense) (Details) (USD $) In Thousands	12 Months Ended
	Jul. 31, 2011
Estimated amortization expense, 2012	$ 21,207
Estimated amortization expense, 2013	20,656
Estimated amortization expense, 2014	17,389
Estimated amortization expense, 2015	14,561
Estimated amortization expense, 2016	14,390
Ferrellgas, L.P. And Subsidiaries [Member]
Estimated amortization expense, 2012	21,207
Estimated amortization expense, 2013	20,656
Estimated amortization expense, 2014	17,389
Estimated amortization expense, 2015	14,561
Estimated amortization expense, 2016	$ 14,390