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Stock-Based Compensation - Performance Restricted Stock Units (Details) - Performance Restricted Stock Units [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Dec. 07, 2017
Apr. 30, 2018
Apr. 30, 2018
Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance Restricted Stock Units Granted 78,200      
Granted (in usd per share)     $ 17.76  
Performance restricted stock units shares forfeited       2,100
Allocated Share-based Compensation Expense   $ 0.1 $ 0.2  
Level 1 [Member] | A-TSR greater than or equal to 50% [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance restricted stock units vesting percentage maximum     150.00%  
Level 2 [Member] | A-TSR less than 50% and greater than or equal to 20% [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance restricted stock units vesting percentage maximum     100.00%  
Level 3 [Member] | A-TSR less than 20% and greater than or equal to -20% [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance restricted stock units vesting percentage maximum     50.00%  
Level 4 [Member] | A-TSR less than -20% [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance restricted stock units vesting percentage maximum     0.00%  
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance restricted stock units vesting percentage maximum     0.00%  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance restricted stock units vesting percentage maximum     150.00%