Components of Other Non-Operating (Expense) Income (Parenthetical) (Detail) (Fiscal Year 2005 and 2006, USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Fiscal Year 2005 and 2006
Component Of Other Expense Income Nonoperating [Line Items]
Reversal of liability related to legal matters	$ 12.8