Supplemental Financial Statement Information Supplemental Financial Statement Information (Other Assets) (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jul. 31, 2016
Other assets, net	$ 74,057	$ 87,223
Other Assets	41,557	47,463
Jamex Marketing, LLC [Member]
Accounts Receivable, Related Parties, Noncurrent	32,500	39,800
Ferrellgas, L.P. [Member]
Other assets, net	74,057	87,223
Other Assets	41,557	47,463
Ferrellgas, L.P. [Member] | Jamex Marketing, LLC [Member]
Accounts Receivable, Related Parties, Noncurrent	$ 32,500	$ 39,800