Restructuring Charges - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Restructuring Cost and Reserve [Line Items]
Beginning balance			$ 3.0
Costs incurred and charged to expense	4.2	1.9	10.5	2.7
Costs paid or otherwise settled			(8.8)
Ending balance	4.7		4.7
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			1.8
Costs incurred and charged to expense	3.7		8.4
Costs paid or otherwise settled			(6.4)
Ending balance	3.8		3.8
Other Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			1.2
Costs incurred and charged to expense			2.1
Costs paid or otherwise settled			(2.4)
Ending balance	$ 0.9		$ 0.9