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Summary of Significant Accounting Policies - Accumulated Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2021 | Apr. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | $ 191,729 | $ 212,817 | $ 195,760 | $ 221,688
Ending balance | 193,087 | 205,840 | 193,087 | 205,840
Foreign Currency Translation (Loss) Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  |  | (3,069) | (2,362)
Other comprehensive income | 577 | (619) | 1,372 | (1,886)
Ending balance | (1,697) | (4,248) | (1,697) | (4,248)
Defined Benefit Pension Plan |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  |  | (4,479) | (4,753)
Other comprehensive income | 134 | 60 | 268 | 195
Ending balance | (4,211) | (4,558) | (4,211) | (4,558)
Available-for-Sale Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  |  | 0 | (140)
Other comprehensive income | 0 | 140 | 0 | 140
Ending balance | 0 | 0 | 0 | 0
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | (6,619) | (8,387) | (7,548) | (7,255)
Other comprehensive income | 711 | (419) | 1,640 | (1,551)
Ending balance | $ (5,908) | $ (8,806) | $ (5,908) | $ (8,806)

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