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Supplemental Financial Statement Information (Narrative) (Details)
6 Months Ended
Jan. 31, 2013
Supplemental Financial Statement Information [Line Items]  
Net procurement of fixed priced propane by Ferrellgas in gallons 78,000,000
Ferrellgas, L.P. [Member]
 
Supplemental Financial Statement Information [Line Items]  
Net procurement of fixed priced propane by Ferrellgas in gallons 78,000,000
Maximum [Member]
 
Supplemental Financial Statement Information [Line Items]  
Supply procurement contract duration 36 months
Maximum [Member] | Ferrellgas, L.P. [Member]
 
Supplemental Financial Statement Information [Line Items]  
Supply procurement contract duration 36 months