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Stock Plans - Narrative (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 18, 2019 USD ($) shares | Mar. 31, 2018 USD ($) director $ / shares shares | Oct. 31, 2019 USD ($) director $ / shares shares | Oct. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost related to nonvested options | $ |  |  | $ 19,900,000 |
Treasury stock, shares (in shares) | shares |  |  | 4,100,000 | 3,600,000
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options granted in period (in shares) | shares |  |  | 198,232 |
Total unrecognized compensation cost expected to be recognized over a remaining weighted-average vesting period (in years) |  |  | 3 years 3 months 18 days |
Performance Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
Total unrecognized compensation cost expected to be recognized over a remaining weighted-average vesting period (in years) |  |  | 1 year |
Total unrecognized compensation cost related to nonvested units | $ |  |  | $ 400,000 |
Target percentage of shares earned |  |  |  | 100.00%
Performance Units | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target percentage of shares earned |  |  | 0.00% |
Performance Units | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target percentage of shares earned |  |  | 150.00% |
Second Amended and Restated 2006 Directors Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of non-employee directors in committee | director |  | 2 |  |
Number of shares authorized to be granted (in shares) | shares |  | 950,000 |  |
Shares remaining for future grant (in shares) | shares |  |  | 0 |
Options granted in period (in shares) | shares |  |  | 0 | 0
Second Amended and Restated 2006 Directors Plan | Employee Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise price percentage of fair market value on date of grant of awards |  | 100.00% |  |
Award expiration date (no more than) |  | 10 years |  |
Second Amended and Restated 2006 Directors Plan | Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 0.10 |  |
Second Amended and Restated 2006 Directors Plan | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration date (no more than) |  |  | 10 years |
Award vesting period |  |  | 1 year |
Second Amended and Restated 2006 Directors Plan | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 1 year |
Third Amended and Restated 2007 Long-Term Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of non-employee directors in committee | director |  |  | 2 |
Number of shares authorized to be granted (in shares) | shares |  |  | 6,930,000 |
Shares remaining for future grant (in shares) | shares |  |  | 1,280,407 |
Third Amended and Restated 2007 Long-Term Incentive Plan | Employee Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise price percentage of fair market value on date of grant of awards |  |  | 100.00% |
Award expiration date (no more than) |  |  | 10 years |
Third Amended and Restated 2007 Long-Term Incentive Plan | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award expiration date (no more than) |  |  | 10 years |
Weighted-average fair value of each option granted (in dollars per share) | $ / shares |  |  | $ 60.71 | $ 57.86
Total intrinsic value of options exercised | $ |  |  | $ 40,100,000 |
Third Amended and Restated 2007 Long-Term Incentive Plan | Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
Third Amended and Restated 2007 Long-Term Incentive Plan | Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 5 years |
Third Amended and Restated 2007 Long-Term Incentive Plan | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost expected to be recognized over a remaining weighted-average vesting period (in years) |  |  | 3 years 2 months 12 days |
Total unrecognized compensation cost related to nonvested units | $ |  |  | $ 66,100,000 |
Third Amended and Restated 2007 Long-Term Incentive Plan | Restricted Stock Units (RSUs) | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
Third Amended and Restated 2007 Long-Term Incentive Plan | Restricted Stock Units (RSUs) | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 5 years |
Employee Stock Purchase Plan | Employee Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized to be granted (in shares) | shares | 1,000,000 |  |  |
Exercise price percentage of fair market value on date of grant of awards | 85.00% |  |  |
Percentage of employees maximum eligible compensation for purchase of awards | 15.00% |  |  |
Amount of employees maximum eligible compensation for purchase of awards | $ | $ 21,300 |  |  |
Share-Based Payment Arrangement, Nonemployee, Director | Second Amended and Restated 2006 Directors Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total grant value of awards | $ |  | $ 270,000 |  |
Share-Based Payment Arrangement, Nonemployee, Lead Director | Second Amended and Restated 2006 Directors Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total grant value of awards | $ |  | 285,500 |  |
Share-Based Payment Arrangement, Nonemployee, Chairman | Second Amended and Restated 2006 Directors Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total grant value of awards | $ |  | $ 297,000 |  |

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