Segment Reporting Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2016
Jan. 31, 2015
Segment Reporting Information        
Revenues $ 649,238 $ 665,973 $ 1,120,384 $ 1,109,328
Costs and Expenses 510,909 529,045 933,156 938,039
Adjusted EBITDA 138,329 136,928 187,228 171,289
Propane and related equipment sales [Member]        
Segment Reporting Information        
Revenues 460,905 658,820 738,381 1,094,259
Costs and Expenses 338,795 513,006 580,672 906,811
Adjusted EBITDA 122,110 145,814 157,709 187,448
Midstream - Crude Oil Logistics [Member]        
Segment Reporting Information        
Revenues 183,793 0 373,166 0
Costs and Expenses 155,072 0 319,642 0
Adjusted EBITDA 28,721 0 53,524 0
Midstream Operations - Water Solutions [Member]        
Segment Reporting Information        
Revenues 4,540 7,153 8,837 15,069
Costs and Expenses 5,461 5,137 10,237 9,870
Adjusted EBITDA (921) 2,016 (1,400) 5,199
Corporate and Other [Member]        
Segment Reporting Information        
Revenues 0 0 0 0
Costs and Expenses 11,581 10,902 22,605 21,358
Adjusted EBITDA (11,581) (10,902) (22,605) (21,358)
Ferrellgas, L.P. [Member]        
Segment Reporting Information        
Revenues 649,238 665,973 1,120,384 1,109,328
Costs and Expenses 510,511 529,045 932,758 938,042
Adjusted EBITDA 138,727 136,928 187,626 171,286
Ferrellgas, L.P. [Member] | Propane and related equipment sales [Member]        
Segment Reporting Information        
Revenues 460,905 658,820 738,381 1,094,259
Costs and Expenses 338,795 513,006 580,672 906,814
Adjusted EBITDA 122,110 145,814 157,709 187,445
Ferrellgas, L.P. [Member] | Midstream - Crude Oil Logistics [Member]        
Segment Reporting Information        
Revenues 183,793 0 373,166 0
Costs and Expenses 155,072 0 319,642 0
Adjusted EBITDA 28,721 0 53,524 0
Ferrellgas, L.P. [Member] | Midstream Operations - Water Solutions [Member]        
Segment Reporting Information        
Revenues 4,540 7,153 8,837 15,069
Costs and Expenses 5,461 5,137 10,237 9,870
Adjusted EBITDA (921) 2,016 (1,400) 5,199
Ferrellgas, L.P. [Member] | Corporate and Other [Member]        
Segment Reporting Information        
Revenues 0 0 0 0
Costs and Expenses 11,183 10,902 22,207 21,358
Adjusted EBITDA $ (11,183) $ (10,902) $ (22,207) $ (21,358)