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Retirement Plans - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019
Retirement Benefits [Abstract] |  |  |  |
Average earnings |  |  | 5 years |
Contributions | $ 0 | $ 150,000 | $ 0 | $ 450,000

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