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Subsequent Events	6 Months Ended
Subsequent Events	Jan. 31, 2019
Subsequent Event [Line Items]
Subsequent Events	N. Subsequent events Ferrellgas evaluated events and transactions occurring after the balance sheet date through the date Ferrellgas’ condensed consolidated financial statements were issued and concluded that there were no events or transactions occurring during this period that require recognition or disclosure in its condensed consolidated financial statements.
Ferrellgas, L.P. [Member]
Subsequent Event [Line Items]
Subsequent Events	N. Subsequent events Ferrellgas, L.P. evaluated events and transactions occurring after the balance sheet date through the date Ferrellgas, L.P.’s condensed consolidated financial statements were issued and concluded that there were no events or transactions occurring during this period that require recognition or disclosure in its condensed consolidated financial statements.