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Benefit Plans - Additional Information (Details) - USD ($) |  | 7 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 01, 2017 | Oct. 31, 2018 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Apr. 05, 2018 | 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, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 1.78 | $ 1.50 | $ 6.44 |  |
Options exercised |  |  | 0 | 0 | 0 |  |
Intrinsic value, options outstanding |  | $ 0 | $ 0 |  |  |  |
Intrinsic value, options exercisable |  | $ 0 | $ 0 |  |  |  |
Share based compensation arrangement by share based payment award, non option equity instruments, outstanding, number |  | 4,370,575 | 4,370,575 | 3,008,686 |  |  |
Restricted Stock Awards, Weighted Average Remaining Life |  |  | 1 year 4 months 24 days |  |  |  |
Restricted Stock Awards Outstanding, Intrinsic Value |  | $ 3,700,000 | $ 3,700,000 |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  | 158,708 | 86,001 | 24,379 |  |
Noninterest Expense Directors Fees |  |  | $ 300,000 | $ 100,000 | $ 200,000 |  |
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 |  |
Employer Matching Contribution Percentage |  |  | 2.00% |  |  |  |
Defined Contribution Plan, Cost Recognized |  |  | $ 500,000 | $ 500,000 | $ 600,000 |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Employee stock purchase plan, suspended date | May 01, 2017 |  |  |  |  |  |
Restricted Stock Awards and Units [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted Stock or Unit Expense |  |  | $ 6,200,000 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  |  | 2 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock awards, general vesting period |  |  | 4 years |  |  |  |
Maximum [Member] | Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved For Future Issuance |  |  |  |  |  | 500,000 |
Minimum [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock awards, general vesting period |  |  | 3 years |  |  |  |
2018 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved For Future Issuance |  |  |  |  |  | 4,000,000 |
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 |  | 1,400,000 | 1,400,000 |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock Issuance Terms |  | 85.00% | 85.00% |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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