Business Segment Information - Schedule of Selected Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Oct. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 617.0	$ 597.7	$ 1,750.8	$ 1,721.4
Depreciation and amortization	10.9	11.7	34.8	33.9
Capital expenditures	4.7	8.2	14.1	31.9
Total assets	1,406.1	1,403.1	1,406.1	1,403.1	$ 1,408.1
Fire & Emergency [Member]
Segment Reporting Information [Line Items]
Net sales	247.7	238.9	699.0	706.1
Depreciation and amortization	3.6	3.3	10.6	11.8
Capital expenditures	2.1	2.1	5.3	4.8
Total assets	622.8	607.4	622.8	607.4
Adjusted EBITDA	12.1	25.3	35.8	65.5
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	203.8	157.6	514.5	447.9
Depreciation and amortization	2.0	1.9	6.7	7.5
Capital expenditures	1.4	1.1	3.1	3.4
Total assets	328.5	299.2	328.5	299.2
Adjusted EBITDA	19.4	11.8	39.7	25.7
Recreation [Member]
Segment Reporting Information [Line Items]
Net sales	166.7	197.3	542.6	563.4
Depreciation and amortization	3.6	3.6	12.0	9.5
Capital expenditures	0.6	2.1	3.0	6.3
Total assets	336.6	359.9	336.6	359.9
Adjusted EBITDA	12.8	17.9	39.4	38.7
Corporate, Other and Elims [Member]
Segment Reporting Information [Line Items]
Net sales	(1.2)	3.9	(5.3)	4.0
Depreciation and amortization	1.7	2.9	5.5	5.1
Capital expenditures	0.6	2.9	2.7	17.4
Total assets	118.2	136.6	118.2	136.6
Adjusted EBITDA	$ (10.8)	$ (7.4)	$ (32.2)	$ (25.6)