Partners' Capital (Deficit) Partners' Capital (Limited Partner Units) (Details) - shares
|
Jan. 31, 2016 |
Jul. 31, 2015 |
| Related Party Transaction [Line Items] |
|
|
| Limited Partners' Capital Account, Units Outstanding |
98,002,665
|
100,376,789
|
| Public Common Unitholders [Member] |
|
|
| Related Party Transaction [Line Items] |
|
|
| Limited Partners' Capital Account, Units Outstanding |
63,983,547
|
63,294,168
|
| FCI Trading Corp. [Member] |
|
|
| Related Party Transaction [Line Items] |
|
|
| Limited Partners' Capital Account, Units Outstanding |
195,686
|
195,686
|
| Subsidiary of Common Parent [Member] |
|
|
| Related Party Transaction [Line Items] |
|
|
| Limited Partners' Capital Account, Units Outstanding |
22,529,361
|
22,529,361
|
| Ferrell Propane, Inc [Member] |
|
|
| Related Party Transaction [Line Items] |
|
|
| Limited Partners' Capital Account, Units Outstanding |
51,204
|
51,204
|
| James E. Ferrell [Member] |
|
|
| Related Party Transaction [Line Items] |
|
|
| Limited Partners' Capital Account, Units Outstanding |
4,763,475
|
4,763,475
|
| James H. Ballengee [Member] |
|
|
| Related Party Transaction [Line Items] |
|
|
| Limited Partners' Capital Account, Units Outstanding |
6,479,392
|
9,542,895
|