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Goodwill and Intangible Assets - Summary of Goodwill by Segment (Detail) - USD ($) $ in Millions | Jul. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Oct. 31, 2017
--- | --- | --- | --- | ---
Goodwill [Line Items] |  |  |  |
Goodwill | $ 159.8 | $ 161.8 | $ 162.6 | $ 133.2
Fire & Emergency [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 88.6 | 88.6 |  |
Commercial [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 28.7 | 28.7 |  |
Recreation [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | $ 42.5 | $ 44.5 |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Details
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