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Employee and Retiree Benefits (Narrative) (Details) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Nov. 25, 2017
Retirement Benefits [Abstract] |  |  |
Postretirement health care benefits age requirement before distribution occurs |  |  | 55 years
Postretirement health care benefits continuous service requirement |  |  | 15 years
Dollar cap liability reduction |  | 10.00% |
Postretirement health care retiree age requirement | 65 years | 65 years |

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