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 |