Acquisitions - Schedule of Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 01, 2020	Oct. 31, 2020	Oct. 31, 2019
Liabilities:
Gain on acquisition of business		$ (8.6)
Spartan Emergency Response [Member]
Assets:
Accounts receivable, net	$ 22.9
Inventories, net	83.3
Other current assets	0.7
Property, plant and equipment	13.6
Right of use assets	6.0
Total assets acquired	126.5
Liabilities:
Accounts payable	5.3
Customer advances	35.3
Accrued warranty	1.3
Other current liabilities	8.7
Short-term lease obligations	0.8
Deferred income taxes	2.9
Long-term lease obligations	5.4
Other long-term liabilities	10.9
Total liabilities assumed	70.6
Net assets acquired	55.9
Consideration paid	47.3
Gain on acquisition of business	$ (8.6)	$ (8.6)	$ (11.9)