Divestiture Activities - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
	May 08, 2020	Jul. 31, 2020	Jan. 31, 2020	Apr. 30, 2019	Jan. 31, 2019	Jul. 31, 2020	Apr. 30, 2020	Oct. 31, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net cash proceeds from sale of business						$ 50.9
Gain (loss) on sale of business		$ (0.5)				(9.3)
REV Coach Segment [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net cash proceeds from sale of business			$ 1.1
Expected proceeds to be received from divestiture of businesses next three months							$ 0.9
Property, plant and equipment, net								$ 0.2
Inventories, net								14.0
Accounts receivable, net								0.4
Other current and long-term assets								4.9
Accounts payable								11.7
Other current and long-term liabilities								$ 3.7
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 (loss) on sale of business				$ 1.2
Shuttle Bus Businesses [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net cash proceeds from sale of business	$ 48.9
Gain (loss) on sale of business						$ 9.3