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Fair Value Measurements - Other Financial Instruments (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Jul. 31, 2019
Jan. 31, 2017
Fixed Rate 8.625% Due 2020      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate, as a percent 8.625%   8.625%
Level 2 [Member] | Fixed Rate 8.625% Due 2020      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term debt, fair value $ 1,726.9 $ 1,824.6  
Level 2 [Member] | Ferrellgas, L.P. [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term debt, fair value 1,544.9 $ 1,562.2  
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Notes receivable, fair value 11.0    
Notes receivable, carrying amount in excess of fair value 0.3    
Fair Value, Inputs, Level 3 [Member] | Ferrellgas, L.P. [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Notes receivable, fair value 11.0    
Notes receivable, carrying amount in excess of fair value $ 0.3