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ACQUISITIONS AND DIVESTITURES - Pro forma information of acquiree (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2019 | Apr. 30, 2018
Class of Stock [Line Items] |  |  |  |
Pro forma net sales | $ 1,244.8 | $ 1,302.2 | $ 2,474.0 | $ 2,517.2
Pro forma net (loss) income attributable to Greif, Inc. | $ 7.2 | $ 39.4 | $ 28.0 | $ 46.0
Class A Common Stock |  |  |  |
Basic earnings per share attributable to Greif, Inc. common shareholders: |  |  |  |
Basic (in USD per share) | $ 0.12 | $ 0.67 | $ 0.48 | $ 0.79
Diluted (in USD per share) | 0.12 | 0.67 | 0.48 | 0.79
Class B Common Stock |  |  |  |
Basic earnings per share attributable to Greif, Inc. common shareholders: |  |  |  |
Basic (in USD per share) | 0.18 | 1.00 | 0.71 | 1.17
Diluted (in USD per share) | $ 0.18 | $ 1.00 | $ 0.71 | $ 1.17

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