Schedule II Valuation And Qualifying Accounts (Details) - Allowance For Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 5,526	$ 4,816	$ 4,756
Charged to cost / expenses	7	1,703	3,419
Other	(3,557)	(993)	(3,359)
Balance at end of period	1,976	5,526	4,816
Ferrellgas, L.P. [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	5,526	4,816	4,756
Charged to cost / expenses	7	1,703	3,419
Other	(3,557)	(993)	(3,359)
Balance at end of period	$ 1,976	$ 5,526	$ 4,816