Debt Debt (Components of Long-Term Debt) (Details) - USD ($) $ in Thousands |
Jan. 31, 2016 |
Jul. 31, 2015 |
|---|---|---|
| Schedule of Capitalization, Long-term Debt [Line Items] | ||
| Long-term debt | $ 1,894,790 | $ 1,804,392 |
| Short-term borrowings | 86,200 | 75,319 |
| Ferrellgas, L.P. [Member] | ||
| Schedule of Capitalization, Long-term Debt [Line Items] | ||
| Long-term debt | 1,712,790 | 1,622,392 |
| Short-term borrowings | $ 86,200 | $ 75,319 |
| Secured Credit Facility [Member] | ||
| Schedule of Capitalization, Long-term Debt [Line Items] | ||
| Debt weighted average interest rate | 3.70% | 3.50% |
| Secured Credit Facility [Member] | Ferrellgas, L.P. [Member] | ||
| Schedule of Capitalization, Long-term Debt [Line Items] | ||
| Debt weighted average interest rate | 3.70% | 3.50% |