Fair Value Measurements Fair Value Measurements (Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($)
$ in Thousands |
6 Months Ended |
|
Jan. 31, 2016 |
Jul. 31, 2015 |
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |
$ 0
|
$ 100
|
| Accretion [Member] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |
0
|
|
| Fair Value Change due to Unobservable Inputs [Member] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |
(100)
|
|
| Ferrellgas, L.P. [Member] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |
0
|
100
|
| Ferrellgas, L.P. [Member] | Accretion [Member] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |
0
|
|
| Ferrellgas, L.P. [Member] | Fair Value Change due to Unobservable Inputs [Member] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |
$ (100)
|
|
| Fair Value, Inputs, Level 1 [Member] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |
|
0
|
| Fair Value, Inputs, Level 1 [Member] | Ferrellgas, L.P. [Member] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |
|
0
|
| Fair Value, Inputs, Level 2 [Member] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |
|
0
|
| Fair Value, Inputs, Level 2 [Member] | Ferrellgas, L.P. [Member] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |
|
0
|
| Fair Value, Inputs, Level 3 [Member] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |
|
100
|
| Fair Value, Inputs, Level 3 [Member] | Ferrellgas, L.P. [Member] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |
|
$ 100
|