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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)