Supplemental Financial Statement Information (Other Current Liabilities) (Details) - USD ($) $ in Thousands	Oct. 31, 2016	Jul. 31, 2016
Accrued interest	$ 45,118	$ 16,623
Accrued payroll	25,738	13,438
Customer deposits and advances	40,238	27,391
Price risk management liabilities	8,030	18,401
Other	51,403	53,105
Other current liabilities	170,527	128,958
Ferrellgas, L.P. [Member]
Accrued interest	39,188	14,617
Accrued payroll	25,738	13,438
Customer deposits and advances	40,238	27,391
Price risk management liabilities	8,030	18,401
Other	51,403	53,105
Other current liabilities	$ 164,597	$ 126,952