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Debt Debt (Components of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Jul. 31, 2014
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt $ 1,344,392us-gaap_LongTermDebtNoncurrent $ 1,292,214us-gaap_LongTermDebtNoncurrent
Short-term borrowings 0us-gaap_ShortTermBorrowings 69,519us-gaap_ShortTermBorrowings
Ferrellgas, L.P. [Member]    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt 1,162,392us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember		 1,110,214us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
Short-term borrowings $ 0us-gaap_ShortTermBorrowings
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember		 $ 69,519us-gaap_ShortTermBorrowings
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
Secured Credit Facility [Member]    
Schedule of Capitalization, Long-term Debt [Line Items]    
Debt weighted average interest rate 3.50%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 3.40%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Secured Credit Facility [Member] | Ferrellgas, L.P. [Member]    
Schedule of Capitalization, Long-term Debt [Line Items]    
Debt weighted average interest rate 3.50%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 3.40%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember