Business Segment Information - Schedule of Selected Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Oct. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 615.0	$ 608.9	$ 1,133.7	$ 1,123.8
Depreciation and amortization	11.6	11.1	23.8	22.1
Capital expenditures	3.1	10.0	9.4	23.6
Total assets	1,413.3	1,358.7	1,413.3	1,358.7	$ 1,408.1
Fire & Emergency [Member]
Segment Reporting Information [Line Items]
Net sales	247.1	252.0	451.2	467.3
Depreciation and amortization	3.5	4.0	7.0	8.5
Capital expenditures	1.8	1.1	3.2	2.7
Total assets	627.2	613.7	627.2	613.7
Adjusted EBITDA	15.1	21.8	23.4	39.9
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	170.0	158.0	310.6	290.2
Depreciation and amortization	2.1	2.8	4.7	5.6
Capital expenditures	1.1	1.3	1.7	2.3
Total assets	322.3	288.0	322.3	288.0
Adjusted EBITDA	14.7	9.5	19.7	13.9
Recreation [Member]
Segment Reporting Information [Line Items]
Net sales	199.7	198.8	375.9	366.0
Depreciation and amortization	4.3	3.1	8.3	5.9
Capital expenditures	1.0	2.9	2.4	4.2
Total assets	356.6	337.5	356.6	337.5
Adjusted EBITDA	17.3	12.7	26.5	20.8
Corporate, Other and Elims [Member]
Segment Reporting Information [Line Items]
Net sales	(1.8)	0.1	(4.0)	0.3
Depreciation and amortization	1.7	1.2	3.8	2.1
Capital expenditures	(0.8)	4.7	2.1	14.4
Total assets	107.2	119.5	107.2	119.5
Adjusted EBITDA	$ (11.0)	$ (10.0)	$ (21.2)	$ (19.2)

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Capital Expenditures Incurred

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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