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, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Restructuring Cost and Reserve [Line Items]
Beginning balance			$ 8.0
Costs incurred and charged to expense	4.2	3.9	5.4	22.9
Costs paid or otherwise settled			(10.0)
Ending balance	3.4		3.4
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			6.2
Costs incurred and charged to expense	1.3		0.9
Costs paid or otherwise settled			(5.0)
Ending balance	2.1		2.1
Other Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			1.8
Costs incurred and charged to expense	0.6		1.7
Costs paid or otherwise settled			(2.2)
Ending balance	1.3		1.3
Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense			2.8
Costs paid or otherwise settled			$ (2.8)