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Divestiture Activities - Additional Information (Detail) - USD ($)
$ in Millions
Feb. 21, 2019
Dec. 21, 2018
Apr. 30, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Property, plant and equipment, net     $ 1.4
Inventories, net     3.0
Accounts receivable, net     6.4
Other current and long-term assets     1.2
Accounts payable     4.7
Current portion of long-term debt     1.4
Other current and long-term liabilities     $ 0.6
Mobility Van Business [Member] | Commercial Segment [Member]      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Annual sales of discontinued operation   $ 40.0  
Regional Technical Center [Member]      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Net cash proceeds from sale of business $ 11.4    
Gain on sale of business $ 1.2