Restructuring Charges - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 8.0
Costs incurred and charged to expense	1.3	8.9
Costs paid or otherwise settled	(2.5)
Ending balance	6.8
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	6.2
Costs incurred and charged to expense	0.7
Costs paid or otherwise settled	(1.7)
Ending balance	5.2
Other Restructuring Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	1.8
Costs incurred and charged to expense	0.5
Costs paid or otherwise settled	(0.8)
Ending balance	1.5
Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance
Costs incurred and charged to expense	0.1
Costs paid or otherwise settled
Ending balance	$ 0.1