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Basic and Diluted Net Income (Loss) per Share - Narrative (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2021
Apr. 30, 2021
Restricted Shares    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 178 185