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Acquisitions and Divestitures - Pro Forma Information of Acquiree (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2019 | Oct. 31, 2018
Pro forma net sales | $ 4,958.8 | $ 5,249.4
Pro forma net (loss) income attributable to Greif, Inc. | $ 154.8 | $ 152.7
Class A common stock |  |
Basic (in USD per share) | $ 2.62 | $ 2.60
Diluted (in USD per share) | 2.62 | 2.59
Class B common stock |  |
Basic (in USD per share) | 3.92 | 3.88
Diluted (in USD per share) | $ 3.92 | $ 3.88

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