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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill impairment loss $ 0   $ 0  
Amortization expense $ 262,000 $ 205,000 $ 752,000 $ 383,000