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Leases - Comparative Information - Contractual Operating Lease Commitments And Buyout Maturities (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Operating Leased Assets [Line Items]    
Rental expense $ 53,800 $ 50,700
Operating Lease Obligations [Member]    
Operating Leased Assets [Line Items]    
2020 44,392  
2021 36,134  
2022 26,312  
2023 20,432  
2024 17,196  
Thereafter 17,414  
Operating Lease Buyouts [Member]    
Operating Leased Assets [Line Items]    
2020 3,073  
2021 4,371  
2022 6,421  
2023 3,527  
2024 1,238  
Thereafter 14,433  
Ferrellgas, L.P. [Member]    
Operating Leased Assets [Line Items]    
Rental expense 53,800 $ 50,700
Ferrellgas, L.P. [Member] | Operating Lease Obligations [Member]    
Operating Leased Assets [Line Items]    
2020 44,392  
2021 36,134  
2022 26,312  
2023 20,432  
2024 17,196  
Thereafter 17,414  
Ferrellgas, L.P. [Member] | Operating Lease Buyouts [Member]    
Operating Leased Assets [Line Items]    
2020 3,073  
2021 4,371  
2022 6,421  
2023 3,527  
2024 1,238  
Thereafter $ 14,433