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v3.19.3.a.u2

Summary of Significant Accounting Policies and Related Data - Other Long-Lived Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Indefinite-lived Intangible Assets [Line Items] |  |  |
Impairment of long-lived assets held-for-use | $ 0 | $ 0 | $ 0
Minimum |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Estimated useful life (years) | 1 year |  |
Maximum |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Estimated useful life (years) | 20 years |  |

X
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