Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities (Derivatives Not Designated as Hedging Effect on Earnings) (Details) - Operating Expense [Member] - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended |
|---|---|---|
Jan. 31, 2016 |
Jan. 31, 2016 |
|
| Propane and related equipment sales [Member] | ||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (3,696) | $ (4,734) |
| Propane and related equipment sales [Member] | Ferrellgas, L.P. [Member] | ||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (3,696) | (4,734) |
| Midstream - Crude Oil Logistics [Member] | ||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 2,992 | 4,020 |
| Midstream - Crude Oil Logistics [Member] | Ferrellgas, L.P. [Member] | ||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 2,992 | $ 4,020 |