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Quarterly Financial Data (Unaudited) - Quarterly Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Quarterly Results Of Operations [Line Items]                      
Net sales $ 868.5 $ 930.0 $ 915.9 $ 902.3 $ 1,048.1 $ 1,124.0 $ 1,065.5 $ 1,001.5 $ 3,616.7 $ 4,239.1 $ 4,219.9
Gross profit 168.0 166.8 181.1 153.9 202.9 217.7 204.3 186.1 669.8 811.0 832.2
Net income (loss) 9.2 9.3 20.5 28.2 (35.5) 11.5 37.1 31.8 67.2 44.9 147.5
Net income attributable to Greif, Inc. $ 12.4 $ 8.6 $ 20.8 $ 30.1 $ 8.7 $ 13.7 $ 38.4 $ 30.7 $ 71.9 $ 91.5 $ 144.7
Class A Common Stock [Member]                      
Basic earnings per share attributable to Greif, Inc.:                      
EPS Basic $ 0.21 $ 0.15 $ 0.35 $ 0.52 $ 0.15 $ 0.23 $ 0.65 $ 0.53 $ 1.23 $ 1.56 $ 2.47
Diluted earnings per share attributed to Greif, Inc.:                      
EPS Diluted $ 0.21 $ 0.15 $ 0.35 $ 0.52 $ 0.15 $ 0.23 $ 0.65 $ 0.53 $ 1.23 $ 1.56 $ 2.47
Basic:                      
Basic shares 25,693,564 25,692,973 25,678,393 25,607,886 25,603,452 25,576,452 25,540,341 25,470,354 25,668,204 25,547,650 25,399,256
Diluted:                      
Diluted shares 25,701,264 25,698,547 25,688,653 25,617,814 25,554,934 25,581,952 25,560,846 25,495,642 25,674,105 25,552,986 25,422,322
Class B Common Stock [Member]                      
Basic earnings per share attributable to Greif, Inc.:                      
EPS Basic $ 0.32 $ 0.22 $ 0.53 $ 0.76 $ 0.22 $ 0.35 $ 0.98 $ 0.78 $ 1.83 $ 2.33 $ 3.70
Diluted earnings per share attributed to Greif, Inc.:                      
EPS Diluted $ 0.32 $ 0.22 $ 0.53 $ 0.76 $ 0.22 $ 0.35 $ 0.98 $ 0.78 $ 1.83 $ 2.33 $ 3.70
Basic:                      
Basic shares 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966
Diluted:                      
Diluted shares 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966 22,119,966
Maximum [Member] | Class A Common Stock [Member]                      
Diluted:                      
Market price of common stock $ 35.97 $ 41.65 $ 41.97 $ 45.94 $ 50.85 $ 56.53 $ 54.98 $ 56.47      
Maximum [Member] | Class B Common Stock [Member]                      
Diluted:                      
Market price of common stock 47.97 47.80 45.89 47.39 55.00 61.09 59.20 60.00      
Minimum [Member] | Class A Common Stock [Member]                      
Diluted:                      
Market price of common stock 27.13 29.43 34.52 36.43 41.75 49.70 47.91 50.35      
Minimum [Member] | Class B Common Stock [Member]                      
Diluted:                      
Market price of common stock 33.42 36.59 40.40 41.47 47.90 53.06 53.03 51.10      
Close [Member] | Class A Common Stock [Member]                      
Diluted:                      
Market price of common stock 32.33 30.20 39.29 36.43 44.06 50.18 54.19 50.63      
Close [Member] | Class B Common Stock [Member]                      
Diluted:                      
Market price of common stock $ 37.98 $ 37.13 $ 45.89 $ 41.47 $ 50.20 $ 53.62 $ 58.81 $ 55.51