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Retirement Plans - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019
Retirement Benefits [Abstract] |  |  |  |
Average earnings |  |  | 5 years |
Contributions | $ 0 | $ 150,000 | $ 0 | $ 300,000

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