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Benefit Plans - Additional Information (Details) - USD ($)
12 Months Ended
May 01, 2017
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Apr. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common Stock, Capital Shares Reserved for Future Issuance         4,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   200,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 1.50 $ 6.44 $ 13.24  
Options exercised   0 0 0  
Intrinsic value, options outstanding   $ 70,000      
Intrinsic value, options exercisable   $ 50,000      
Share based compensation arrangement by share based payment award, non option equity instruments, outstanding, number   3,008,686 990,035    
Restricted Stock Awards, Weighted Average Remaining Life   2 years 6 months      
Restricted Stock Awards Outstanding, Intrinsic Value   $ 6,100,000      
Stock Issued During Period, Shares, Issued for Services   86,001 24,379 2,399  
Noninterest Expense Directors Fees   $ 100,000 $ 200,000 $ 100,000  
ESOP, period for which sale of shares is restricted   6 months      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 1.76 $ 6.86    
Employee stock purchase plan, suspended date May 01, 2017        
Employer Matching Contribution Percentage   2.00%      
Defined Contribution Plan, Cost Recognized   $ 500,000 $ 600,000 $ 400,000  
Employee Stock Purchase Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common Stock, Capital Shares Reserved for Future Issuance   70 62,226    
Stock Issuance Terms   85.00%      
Restricted Stock Awards and Units [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Restricted Stock or Unit Expense   $ 6,000,000      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   2 years 6 months      
Maximum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Restricted stock awards, general vesting period   4 years      
Minimum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Restricted stock awards, general vesting period   3 years