Fair Value Measurements Fair Value Measurements (Fair Value Inputs, Liabilities, Quantitative Information) (Details) - USD ($) $ in Thousands |
Jan. 31, 2016 |
Jul. 31, 2015 |
|---|---|---|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | $ 0 | $ 100 |
| Ferrellgas, L.P. [Member] | ||
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | $ 0 | $ 100 |