Restructuring and Other Related Charges - Schedule of Restructuring Reserves Related (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 31, 2024	Jul. 31, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring provision	$ 4.7	$ 9.2
Utilized - cash		(2.6)
Balance at end of the period	6.6	6.6
Employee Severance and Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring provision		6.6
Utilized - cash		(1.6)
Balance at end of the period	5.0	5.0
Contract Termination and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring provision		2.6
Utilized - cash		(1.0)
Balance at end of the period	$ 1.6	$ 1.6