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Employee Benefits - Narrative (Details) - USD ($) | 3 Months Ended
--- | ---
Jan. 31, 2020 | Jan. 31, 2019
Retirement Benefits [Abstract] |  |
Defined benefit plan, contributions by employer | $ 0 | $ 0
Defined benefit plan, expected contributions by employer for remainder of fiscal year | $ 10,000,000.0 |
Expected rate of return on plan assets for determining net periodic pension cost | 8.00% |

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