Acquisition - Schedule of Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions		9 Months Ended
	Feb. 01, 2020	Jul. 31, 2020
Liabilities:
Gain on acquisition of business		$ (11.9)
Spartan Emergency Response [Member]
Assets:
Accounts receivable, net	$ 30.9
Inventories, net	77.7
Other current assets	2.4
Property, plant and equipment	15.2
Right of use assets	6.0
Total assets acquired	132.2
Liabilities:
Accounts payable	5.0
Customer advances	32.8
Accrued warranty	2.7
Other current liabilities	5.1
Short-term lease obligations	0.8
Deferred income taxes	3.9
Long-term lease obligations	5.4
Other long-term liabilities	9.8
Total liabilities assumed	65.5
Net assets acquired	66.7
Consideration paid	54.8
Gain on acquisition of business	$ (11.9)