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Acquisition - Schedule of Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Feb. 01, 2020
Apr. 30, 2020
Apr. 30, 2020
Liabilities:      
Gain on acquisition of business   $ (11.9) $ (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 0.7    
Other current liabilities 7.1    
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)