Schedule II Valuation And Qualifying Accounts (Details) - Allowance For Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 2,455	$ 1,976	$ 5,526
Charged to cost / expenses	1,525	1,778	7
Other	(1,517)	(1,299)	(3,557)
Balance at end of period	2,463	2,455	1,976
Ferrellgas, L.P. [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	2,455	1,976	5,526
Charged to cost / expenses	1,525	1,778	7
Other	(1,517)	(1,299)	(3,557)
Balance at end of period	$ 2,463	$ 2,455	$ 1,976