Changes in Carrying Amounts of Goodwill by Segment (Parenthetical) (Detail) (Goodwill, USD $) In Millions, unless otherwise specified	12 Months Ended
Oct. 31, 2012
Goodwill
Goodwill [Line Items]
Reclassification adjustment	$ 2.9

The amount of a reclassification adjustment made to prior period financial statement amounts.

No definition available.

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration