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Quarterly Financial Data (Unaudited) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2020 | Jul. 31, 2020 | Apr. 30, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018
Quarterly Results Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,161.3 | $ 1,083.0 | $ 1,158.3 | $ 1,112.4 | $ 1,232.1 | $ 1,252.6 | $ 1,213.3 | $ 897.0 | $ 4,515.0 | $ 4,595.0 | $ 3,873.8
Gross profit | 231.7 | 219.7 | 240.7 | 222.6 | 259.0 | 279.4 | 248.7 | 172.8 | 914.7 | 959.9 | 788.9
Net income | 48.0 | 24.4 | 15.8 | 36.1 | 69.8 | 67.5 | 21.1 | 35.8 | 124.3 | 194.2 | 229.5
Net income attributable to Greif, Inc. | 44.4 | $ 20.7 | $ 11.4 | $ 32.3 | 65.0 | $ 62.7 | $ 13.6 | $ 29.7 | 108.8 | 171.0 | 209.4
Diluted: |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs | 3.5 |  |  |  | 7.5 |  |  |  | 17.0 | 29.7 | 0.7
Restructuring charges | 11.9 |  |  |  | 5.8 |  |  |  | 38.7 | 26.1 | 18.6
Non-cash asset impairment charges | 1.6 |  |  |  | 5.7 |  |  |  | 18.5 | 7.8 | 8.3
Gain on disposals of properties, plants and equipment, net | (17.1) |  |  |  | (6.8) |  |  |  | $ (19.2) | $ (13.9) | $ (5.6)
Gain (Loss) on sale of business | $ 0.9 |  |  |  | $ 0.7 |  |  |  |  |  |
Class A common stock |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |
Basic (usd per share) | $ 0.74 | $ 0.35 | $ 0.19 | $ 0.55 | $ 1.09 | $ 1.06 | $ 0.23 | $ 0.51 | $ 1.83 | $ 2.89 | $ 3.56
Diluted: |  |  |  |  |  |  |  |  |  |  |
Diluted (usd per share) | $ 0.74 | $ 0.35 | $ 0.19 | $ 0.55 | $ 1.09 | $ 1.06 | $ 0.23 | $ 0.51 | $ 1.83 | $ 2.89 | $ 3.55
Basic: |  |  |  |  |  |  |  |  |  |  |
Basic (shares) | 26,441,986 | 26,441,986 | 26,386,439 | 26,260,943 | 26,257,943 | 26,257,943 | 26,250,460 | 25,991,433 | 26,382,838 | 26,189,445 | 25,915,887
Diluted: |  |  |  |  |  |  |  |  |  |  |
Diluted (shares) | 26,512,331 | 26,442,595 | 26,386,439 | 26,414,280 | 26,360,148 | 26,257,943 | 26,255,112 | 25,991,433 | 26,390,643 | 26,215,111 | 25,965,856
Market price of common stock (usd per share) | $ 40.59 | $ 34.38 | $ 33.08 | $ 38.77 | $ 39.17 | $ 34.57 | $ 38.59 | $ 37.67 |  |  |
Class B common stock |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |
Basic (usd per share) | 1.12 | 0.52 | 0.29 | 0.81 | 1.65 | 1.59 | 0.34 | 0.75 | $ 2.74 | $ 4.33 | $ 5.33
Diluted: |  |  |  |  |  |  |  |  |  |  |
Diluted (usd per share) | $ 1.12 | $ 0.52 | $ 0.29 | $ 0.81 | $ 1.65 | $ 1.59 | $ 0.34 | $ 0.75 | $ 2.74 | $ 4.33 | $ 5.33
Basic: |  |  |  |  |  |  |  |  |  |  |
Basic (shares) | 22,007,725 | 22,007,725 | 22,007,725 | 22,007,725 | 22,007,725 | 22,007,725 | 22,007,725 | 22,007,725 | 22,000,000.0 | 22,000,000.0 | 22,000,000.0
Diluted: |  |  |  |  |  |  |  |  |  |  |
Diluted (shares) | 22,007,725 | 22,007,725 | 22,007,725 | 22,007,725 | 22,007,725 | 22,007,725 | 22,007,725 | 22,007,725 | 22,000,000.0 | 22,000,000.0 | 22,000,000.0
Market price of common stock (usd per share) | $ 43.25 | $ 38.67 | $ 38.50 | $ 45.05 | $ 47.03 | $ 42.39 | $ 47.23 | $ 43.18 |  |  |
Maximum | Class A common stock |  |  |  |  |  |  |  |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (usd per share) | 43.82 | 40.56 | 40.82 | 44.63 | 40.59 | 39.15 | 41.49 | 49.28 |  |  |
Maximum | Class B common stock |  |  |  |  |  |  |  |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (usd per share) | 47.19 | 43.65 | 48.45 | 51.40 | 48.76 | 47.69 | 48.57 | 50.55 |  |  |
Minimum | Class A common stock |  |  |  |  |  |  |  |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (usd per share) | 34.44 | 27.57 | 24.10 | 38.64 | 30.05 | 30.74 | 37.10 | 31.22 |  |  |
Minimum | Class B common stock |  |  |  |  |  |  |  |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (usd per share) | $ 38.29 | $ 34.94 | $ 30.80 | $ 45.05 | $ 37.96 | $ 41.10 | $ 42.48 | $ 36.87 |  |  |

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