Business Segment Information - Schedule of Selected Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Oct. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 582.2	$ 617.0	$ 1,661.3	$ 1,750.8
Depreciation and amortization	9.2	10.9	30.9	34.8
Capital expenditures	2.0	4.7	9.7	14.1
Total assets	1,409.4	1,406.1	1,409.4	1,406.1	$ 1,347.1
Operating Segment [Member] | Fire & Emergency [Member]
Segment Reporting Information [Line Items]
Net sales	306.7	247.7	802.4	699.0
Depreciation and amortization	3.1	3.6	10.2	10.6
Capital expenditures	1.0	1.8	5.0	5.0
Total assets	766.9	622.8	766.9	622.8
Adjusted EBITDA	12.9	12.1	25.1	35.8
Operating Segment [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	92.4	203.8	393.8	514.5
Depreciation and amortization	1.1	2.0	4.7	6.7
Capital expenditures	0.3	1.4	1.7	3.1
Total assets	205.9	328.5	205.9	328.5
Adjusted EBITDA	10.3	19.4	28.1	39.7
Operating Segment [Member] | Recreation [Member]
Segment Reporting Information [Line Items]
Net sales	182.7	166.7	463.6	542.6
Depreciation and amortization	3.4	3.6	10.2	12.0
Capital expenditures	0.2	0.6	1.6	3.0
Total assets	309.0	336.6	309.0	336.6
Adjusted EBITDA	12.1	12.8	17.9	39.4
Corporate, Other and Elims [Member]
Segment Reporting Information [Line Items]
Net sales	0.4	(1.2)	1.5	(5.3)
Depreciation and amortization	1.6	1.7	5.8	5.5
Capital expenditures	0.5	0.9	1.4	3.0
Total assets	127.6	118.2	127.6	118.2
Adjusted EBITDA	$ (13.9)	$ (10.8)	$ (31.5)	$ (32.2)