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Summary of Significant Accounting Policies - Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net Amount |  |  | $ 733 | $ (6)
Foreign Currency Translation (Loss) Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax Amount | $ (1,042) | $ 1,410 | 330 | (476)
Tax Expense | 0 | 0 | 0 | 0
Net Amount | (1,042) | 1,410 | 330 | (476)
Defined Benefit Pension Plan |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax Amount | 185 | 185 | 553 | 480
Tax Expense | (50) | (50) | (150) | (150)
Net Amount | 135 | 135 | 403 | 330
Available-for-Sale Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax Amount |  |  | 0 | 0
Tax Expense |  |  | 0 | 140
Net Amount |  |  | 0 | 140
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-tax Amount | (857) | 1,595 | 883 | 4
Tax Expense | (50) | (50) | (150) | (10)
Net Amount | $ (907) | $ 1,545 | $ 733 | $ (6)

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