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Earnings Per Share - Computation Earnings Per Share Basic and Diluted (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 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
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Numerator for basic and diluted EPS -                      
Net income attributable to Greif $ 26.5 $ 38.5 $ 39.4 $ 21.7 $ 20.8 $ 66.0 $ 50.3 $ 40.4 $ 126.1 $ 177.5 $ 202.8
Cash dividends                 97.7 97.8 93.1
Undistributed net income attributable to Greif, Inc.                 $ 28.4 $ 79.7 $ 109.7
Class A Common Stock [Member]
                      
Denominator for basic EPS -                      
Denominator for basic EPS 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
Denominator for diluted EPS                      
Denominator for diluted EPS 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
EPS 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
EPS 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
Class B Common Stock [Member]
                      
Denominator for basic EPS -                      
Denominator for basic EPS 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
Denominator for diluted EPS                      
Denominator for diluted EPS 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
EPS 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
EPS 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