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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 9 Months Ended 12 Months Ended
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Jul. 31, 2012
Oct. 31, 2012
Oct. 31, 2011
Numerator for basic and diluted EPS                
Net income attributable to Greif, Inc. $ 46.7 $ 40.2 $ 23.6 $ 37.5 $ 110.5 $ 96.6 $ 122.4 $ 174.7
Cash dividends 24.6     24.5 73.6 73.2    
Undistributed net income attributable to Greif, Inc. $ 22.1     $ 13.0 $ 36.9 $ 23.4    
Class A Common Stock [Member]
                
Denominator for basic EPS                
Denominator for basic EPS 25,435,379     25,177,924 25,380,754 25,126,828    
Denominator for diluted EPS                
Denominator for diluted EPS 25,464,862     25,271,088 25,409,091 25,230,423    
EPS Basic                
EPS Basic $ 0.80 $ 0.69 $ 0.41 $ 0.64 $ 1.89 $ 1.66 $ 2.10 $ 3.00
EPS Diluted                
EPS Diluted $ 0.80 $ 0.69 $ 0.41 $ 0.64 $ 1.89 $ 1.66 $ 2.10 $ 2.99
Dividends per share                
Dividends per share $ 0.42     $ 0.42 $ 1.26 $ 1.26    
Class B Common Stock [Member]
                
Denominator for basic EPS                
Denominator for basic EPS 22,100,000     22,100,000 22,100,000 22,100,000    
Denominator for diluted EPS                
Denominator for diluted EPS 22,100,000     22,100,000 22,100,000 22,100,000    
EPS Basic                
EPS Basic $ 1.20 $ 1.03 $ 0.60 $ 0.96 $ 2.83 $ 2.48 $ 3.14 $ 4.48
EPS Diluted                
EPS Diluted $ 1.20 $ 1.03 $ 0.60 $ 0.96 $ 2.83 $ 2.48 $ 3.14 $ 4.48
Dividends per share                
Dividends per share $ 0.63     $ 0.63 $ 1.88 $ 1.88