Business Segment Information - Reconciliation of Segment Adjusted EBITDA to Net (Loss) Income (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Segment Reporting Information [Line Items]
Interest expense, net	$ (5.7)			$ (8.4)			$ (20.3)	$ (24.2)
Benefit (provision) for income taxes	0.5			(1.9)			13.2
Restructuring costs	(2.5)			(1.3)			(6.0)	(4.2)
Stock-based compensation expense							(7.2)	(7.3)
Loss on sale of business	(0.5)						(9.3)
Gain on acquisition of business							11.9
Impairment charges	(3.7)						(3.7)	(2.8)
Net (loss) income	(3.6)	$ (7.6)	$ (9.4)	5.6	$ 5.6	$ (14.6)	(20.3)	(3.3)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	(13.9)			(10.8)			(31.5)	(32.2)
Operating Segment [Member] | Fire & Emergency [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	12.9			12.1			25.1	35.8
Operating Segment [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	10.3			19.4			28.1	39.7
Operating Segment [Member] | Recreation [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	12.1			12.8			17.9	39.4
Reconciling Items [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	(9.2)			(10.9)			(30.9)	(34.8)
Interest expense, net	(5.7)			(8.4)			(20.3)	(24.2)
Benefit (provision) for income taxes	0.5			(1.9)			13.2
Transaction expenses	(0.6)			(0.5)			(2.6)	(0.7)
Sponsor expense reimbursement	(0.1)						(0.2)	(0.6)
Restructuring costs	(2.5)			(1.3)			(6.0)	(4.2)
Restructuring related charges	(0.7)						(3.9)
Stock-based compensation expense	(1.8)			(2.5)			(7.2)	(7.3)
Legal matters	(0.1)			(0.8)			(1.6)	(5.3)
Loss on sale of business	(0.5)						(9.3)
Gain on acquisition of business							11.9
Impairment charges	(3.7)						(3.7)	(2.8)
(Losses) earnings attributable to assets held for sale	$ (0.6)			(1.0)			0.8	(3.3)
Deferred purchase price payment				$ (0.6)			$ (0.1)	$ (2.8)