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Quarterly Financial Data - Quarterly Results of Operations (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Apr. 30, 2012
Jul. 31, 2012
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Net Sales $ 1,075.6 $ 1,102.9 $ 1,098.2 $ 992.8 $ 1,131.6 $ 1,121.9 $ 1,050.8 $ 943.9     $ 4,269.5 $ 4,248.2 $ 3,461.8
Gross profit 194.6 202.2 205.5 177.4 205.0 210.8 206.9 175.6     779.7 798.4 701.4
Net income 29.6 40.0 39.2 22.8 20.9 68.4 50.5 40.6 62.0 102.0 131.6 180.4 208.5
Net income attributable to Greif, Inc. $ 26.5 $ 38.5 $ 39.4 $ 21.7 $ 20.8 $ 66.0 $ 50.3 $ 40.4     $ 126.1 $ 177.5 $ 202.8
Class A Common Stock [Member]
                          
Earnings per share Basic:                          
EPS Basic $ 0.45 $ 0.66 $ 0.68 $ 0.38 $ 0.36 $ 1.13 $ 0.86 $ 0.70     $ 2.17 $ 3.05 $ 3.48
Diluted:                          
EPS Diluted $ 0.45 $ 0.66 $ 0.67 $ 0.38 $ 0.36 $ 1.12 $ 0.86 $ 0.69     $ 2.17 $ 3.04 $ 3.46
Basic:                          
Basic shares 25,270,259 25,177,924 25,149,691 25,052,868 24,967,000 24,897,665 24,825,768 24,787,857     25,162,686 24,869,573 24,654,364
Diluted:                          
Diluted Shares 25,352,754 25,272,849 25,291,095 25,194,245 25,075,209 25,113,185 25,106,626 25,062,556     25,235,992 25,049,826 24,953,812
Class B Common Stock [Member]
                          
Earnings per share Basic:                          
EPS Basic $ 0.68 $ 0.99 $ 1.01 $ 0.55 $ 0.53 $ 1.69 $ 1.29 $ 1.03     $ 3.24 $ 4.56 $ 5.21
Diluted:                          
EPS Diluted $ 0.68 $ 0.99 $ 1.01 $ 0.55 $ 0.53 $ 1.69 $ 1.29 $ 1.03     $ 3.24 $ 4.56 $ 5.21
Basic:                          
Basic shares 22,119,966 22,119,966 22,120,666 22,120,966 22,238,920 22,362,266 22,385,922 22,412,266     22,100,000 22,300,000 22,400,000
Diluted:                          
Diluted Shares 22,119,966 22,119,966 22,120,666 22,120,966 22,238,920 22,362,266 22,385,922 22,412,266     22,100,000 22,300,000 22,400,000
Maximum [Member] | Class A Common Stock [Member]
                          
Diluted:                          
Market price of common stock $ 47.38 $ 54.90 $ 56.88 $ 49.99 $ 61.73 $ 67.57 $ 67.02 $ 65.76          
Maximum [Member] | Class B Common Stock [Member]
                          
Diluted:                          
Market price of common stock $ 52.70 $ 55.74 $ 57.61 $ 50.39 $ 58.61 $ 62.50 $ 62.85 $ 63.00          
Minimum [Member] | Class A Common Stock [Member]
                          
Diluted:                          
Market price of common stock $ 39.98 $ 38.78 $ 48.02 $ 41.74 $ 40.77 $ 60.53 $ 60.67 $ 57.81          
Minimum [Member] | Class B Common Stock [Member]
                          
Diluted:                          
Market price of common stock $ 45.20 $ 42.15 $ 49.50 $ 42.43 $ 40.55 $ 57.84 $ 57.96 $ 56.75          
Close [Member] | Class A Common Stock [Member]
                          
Diluted:                          
Market price of common stock $ 41.96 $ 43.26 $ 53.64 $ 48.45 $ 44.78 $ 61.05 $ 62.10 $ 63.05          
Close [Member] | Class B Common Stock [Member]
                          
Diluted:                          
Market price of common stock $ 45.30 $ 50.00 $ 54.89 $ 49.50 $ 45.60 $ 58.33 $ 58.21 $ 60.45