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Income Taxes - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2019 USD ($) | Oct. 31, 2020 USD ($) state | Oct. 31, 2019 USD ($) | Oct. 31, 2018 USD ($)
Income Taxes [Line Items] |  |  |  |
U.S. statutory rate |  | 21.00% | 21.00% | 23.30%
Net discrete tax benefit from remeasurement of deferred taxes at new rate due to Tax Act |  |  |  | $ 29.6
Remeasurement of one-time transition tax on deemed repatriation of indefinitely reinvested earnings |  |  | $ 2.7 | $ (4.5)
Tax benefit related to lapse of statute of limitations | $ (1.8) |  | $ (1.3) |
Effective tax rate (percent) |  | 99.60% | 20.40% | (9.40%)
Income tax provision |  | $ (53.1) | $ (32.7) | $ 8.2
Nondeductible impairment loss |  | $ 163.8 |  |
Effective tax rate , excluding nondeductible impairment loss (percent) |  | 24.40% |  |
State true-ups |  | $ 5.7 | 1.7 |
Work opportunity tax credit, adjustment |  | 2.3 | 1.3 |
Income tax benefit related to deduction for energy efficiency |  | 2.1 |  |
Income tax benefit related to change in tax reserves |  | 1.1 |  |
Federal true-ups |  |  | (1.6) |
Income tax benefit related to vesting of share-based compensation awards |  |  | (1.1) |
Benefit resulting from research and development credits |  |  | (0.9) |
Tax credits |  | 4.4 |  |
Unrecognized tax benefits that would impact effective tax rate | 35.3 | 35.5 | 35.3 | 35.8
Maximum decrease in unrecognized tax benefits that is reasonably possible |  | 0.6 |  |
Uncertain tax positions, interest and penalties accrued | $ 1.2 | 1.5 | 1.2 |
Unrecognized tax benefits, interest and penalties expense |  | $ 0.4 | $ 0.2 |
Unrecognized tax benefits, interest and penalties benefit |  |  |  | $ (1.0)
Number of states in which entity operates | state |  | 50 |  |
State and Local Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards |  | $ 102.3 |  |

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