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Business Combinations Business Combinations (Aggregate Fair Values - Water Solutions) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Business Combination, Separately Recognized Transactions [Line Items]      
Goodwill acquisitions $ 0 $ 1,358  
Midstream Operations - Water Solutions [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Working capital     $ 1,155
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     1,704
Aggregate fair value of transactions     74,677
Salt water disposal wells [Member] | Midstream Operations - Water Solutions [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     10,705
Goodwill acquisitions     12,359
Customer Lists [Member] | Midstream Operations - Water Solutions [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Finite-lived Intangible Assets Acquired     38,846
Non-Compete Agreements [Member] | Midstream Operations - Water Solutions [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Finite-lived Intangible Assets Acquired     3,639
Permits and favorable lease arrangements [Member] | Midstream Operations - Water Solutions [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Finite-lived Intangible Assets Acquired     6,269
Ferrellgas, L.P. [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Goodwill acquisitions $ 0 $ 1,358  
Ferrellgas, L.P. [Member] | Midstream Operations - Water Solutions [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Working capital     1,155
Goodwill acquisitions     12,359
Aggregate fair value of transactions     74,677
Ferrellgas, L.P. [Member] | Customer tanks, buildings, land and other [Member] | Midstream Operations - Water Solutions [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     1,704
Ferrellgas, L.P. [Member] | Salt water disposal wells [Member] | Midstream Operations - Water Solutions [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     10,705
Ferrellgas, L.P. [Member] | Customer Lists [Member] | Midstream Operations - Water Solutions [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Finite-lived Intangible Assets Acquired     38,846
Ferrellgas, L.P. [Member] | Non Compete Agreements And Other Intangible Assets [Member] | Midstream Operations - Water Solutions [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Finite-lived Intangible Assets Acquired     3,639
Ferrellgas, L.P. [Member] | Permits and favorable lease arrangements [Member] | Midstream Operations - Water Solutions [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Finite-lived Intangible Assets Acquired     $ 6,269