Income Tax Provision Benefit Allocation (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Provision For Income Taxes [Line Items]
Income tax provision (benefit) attributable to income before income taxes	$ (0.9)	$ 12.2	$ 21.5
Other comprehensive income
Total income tax provision (benefit)	$ (0.9)	$ 12.2	$ 21.5