Supplemental Financial Statement Information Supplemental Financial Statement Information (Other Assets) (Details) - USD ($) $ in Thousands	Apr. 30, 2018	Jul. 31, 2017
Accounts Receivable, Related Parties, Noncurrent	$ 33,962	$ 32,500
Other Assets	38,132	41,557
Other Assets, Noncurrent	72,094	74,057
Ferrellgas, L.P. [Member]
Accounts Receivable, Related Parties, Noncurrent	33,962	32,500
Other Assets	38,132	41,557
Other Assets, Noncurrent	$ 72,094	$ 74,057