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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, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Quarterly Results Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,232.1 | $ 1,252.6 | $ 1,213.3 | $ 897.0 | $ 987.7 | $ 1,012.1 | $ 968.3 | $ 905.7 | $ 4,595.0 | $ 3,873.8 | $ 3,638.2
Gross profit | 259.0 | 279.4 | 248.7 | 172.8 | 204.8 | 217.1 | 195.3 | 171.7 | 959.9 | 788.9 | 714.7
Net income | 69.8 | 67.5 | 21.1 | 35.8 | 45.5 | 72.0 | 51.9 | 60.1 | 194.2 | 229.5 | 135.1
Net income attributable to Greif, Inc. | 65.0 | $ 62.7 | $ 13.6 | $ 29.7 | 40.1 | $ 67.7 | $ 45.1 | $ 56.5 | 171.0 | 209.4 | 118.6
Diluted: |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs | 7.5 |  |  |  |  |  |  |  | 29.7 | 0.7 | 0.7
Restructuring charges | 5.8 |  |  |  | 4.8 |  |  |  | 26.1 | 18.6 | 12.7
Non-cash asset impairment charges | 5.7 |  |  |  | 4.2 |  |  |  | 7.8 | 8.3 | 20.8
Pension settlement charge |  |  |  |  | 0.9 |  |  |  |  |  | 25.9
Gain on disposals of properties, plants and equipment, net | (6.8) |  |  |  | 1.9 |  |  |  | $ (13.9) | $ (5.6) | $ (0.4)
Gain (Loss) on sale of business | $ 0.7 |  |  |  | $ (0.9) |  |  |  |  |  |
Class A common stock |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |
Basic (usd per share) | $ 1.09 | $ 1.06 | $ 0.23 | $ 0.51 | $ 0.68 | $ 1.15 | $ 0.77 | $ 0.96 | $ 2.89 | $ 3.56 | $ 2.02
Diluted: |  |  |  |  |  |  |  |  |  |  |
Diluted (usd per share) | $ 1.09 | $ 1.06 | $ 0.23 | $ 0.51 | $ 0.67 | $ 1.15 | $ 0.77 | $ 0.96 | $ 2.89 | $ 3.55 | $ 2.02
Basic: |  |  |  |  |  |  |  |  |  |  |
Basic (shares) | 26,257,943 | 26,257,943 | 26,250,460 | 25,991,433 | 25,941,279 | 25,941,279 | 25,934,680 | 25,845,758 | 26,189,445 | 25,915,887 | 25,820,470
Diluted: |  |  |  |  |  |  |  |  |  |  |
Diluted (shares) | 26,360,148 | 26,257,943 | 26,255,112 | 25,991,433 | 26,139,524 | 25,941,279 | 25,934,680 | 25,845,758 | 26,215,111 | 25,965,856 | 25,822,940
Market price of common stock (usd per share) | $ 39.17 | $ 34.57 | $ 38.59 | $ 37.67 | $ 47.30 | $ 54.03 | $ 57.63 | $ 57.76 |  |  |
Class B common stock |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |
Basic (usd per share) | 1.65 | 1.59 | 0.34 | 0.75 | 1.03 | 1.72 | 1.14 | 1.44 | $ 4.33 | $ 5.33 | $ 3.02
Diluted: |  |  |  |  |  |  |  |  |  |  |
Diluted (usd per share) | $ 1.65 | $ 1.59 | $ 0.34 | $ 0.75 | $ 1.03 | $ 1.72 | $ 1.14 | $ 1.44 | $ 4.33 | $ 5.33 | $ 3.02
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) | $ 47.03 | $ 42.39 | $ 47.23 | $ 43.18 | $ 51.36 | $ 57.20 | $ 61.56 | $ 61.60 |  |  |
Maximum | Class A common stock |  |  |  |  |  |  |  |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (usd per share) | 40.59 | 39.15 | 41.49 | 49.28 | 58.82 | 60.89 | 59.09 | 62.94 |  |  |
Maximum | Class B common stock |  |  |  |  |  |  |  |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (usd per share) | 48.76 | 47.69 | 48.57 | 50.55 | 63.50 | 64.02 | 63.52 | 68.71 |  |  |
Minimum | Class A common stock |  |  |  |  |  |  |  |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (usd per share) | 30.05 | 30.74 | 37.10 | 31.22 | 44.72 | 51.71 | 48.80 | 49.68 |  |  |
Minimum | Class B common stock |  |  |  |  |  |  |  |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Market price of common stock (usd per share) | $ 37.96 | $ 41.10 | $ 42.48 | $ 36.87 | $ 48.35 | $ 56.01 | $ 52.07 | $ 55.90 |  |  |

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