Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions |
1 Months Ended |
12 Months Ended |
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Jan. 31, 2017 |
Oct. 31, 2016 |
Oct. 31, 2015 |
Oct. 31, 2014 |
May 12, 2017 |
May 12, 2016 |
May 12, 2015 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted (shares) |
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0
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0
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0
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| Stock options fully vested |
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2 years
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| Expiry of options |
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10 years
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| Long term Incentive Plan, Description |
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Long Term Incentive Plan is based on three-year performance periods
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| Long-term incentive plan, Requisite service period |
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3 years
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| Payments for employee long term incentive plan paid in cash |
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50.00%
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| Payments for employee long term incentive plan in restricted shares |
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50.00%
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| Share based compensation expense |
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$ 2.8
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$ 2.8
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$ 3.6
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| Grants in the period (shares) |
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0
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0
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0
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| 2001 Management Equity Incentive and Compensation Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted under various plans (shares) |
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5,000,000
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| Outside Directors Award Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted under various plans (shares) |
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200,000
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| Expiry of option |
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10 years
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| Long Term Incentive Plan Restricted Stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares of restricted stock (shares) |
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40,792
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| Weighted average grant date fair value (usd per share) |
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$ 27.02
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| Share based compensation expense |
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$ 1.5
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$ 1.4
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$ 2.3
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| 2005 Outside Directors Equity Award Plan Restricted Stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares of restricted stock (shares) |
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42,435
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25,560
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| Weighted average grant date fair value (usd per share) |
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$ 26.51
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$ 44.01
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| Share based compensation expense |
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$ 1.1
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| Class A Common Stock 2001 Plan | Officer |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share based compensation expense |
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$ 0.2
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$ 0.3
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$ 0.2
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| Grants in the period (shares) |
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15,000
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| Vesting installments (shares) |
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5,000
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5,000
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| Scenario, Forecast | Long Term Incentive Plan Restricted Stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares of restricted stock (shares) |
31,075
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| Scenario, Forecast | Class A Common Stock 2001 Plan | Officer |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting installments (shares) |
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5,000
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