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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019 | Oct. 31, 2019 | Oct. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Income tax expense (benefit) |  | $ (10.1) | $ 2.5 | $ (12.7) | $ (1.9) |  |
Pre-tax (income) loss |  | 56.10% | (30.80%) | 42.50% | 17.80% |  |
Net discrete tax expense (benefit) related to net operating loss carrybacks |  | $ (5.7) |  | $ (5.4) |  |  |
Net discrete tax expense (benefit) related to share-based compensation |  |  | $ 0.4 |  | $ 0.8 |  |
Net operating loss carryforwards |  |  |  |  |  |  | $ 3.5
Estimate income tax effects due to CARES Act |  | 3.5 |  |  |  |  |
Federal statutory income tax rate | 35.00% |  |  | 21.00% |  |  |
Unrecognized tax benefits |  | 2.7 |  | $ 2.7 |  | $ 2.6 |
Unrecognized tax benefits that would affect the annual effective income tax rate if recognized |  | $ 0.4 |  | $ 0.4 |  |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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