Reconciliation of Unrecognized Tax Benefits (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011
Reconciliation of Unrecognized Tax Benefits [Line Items]
Balance - beginning of year	$ 11.4	$ 17.2
Additions based on tax positions related to the current year	1.9	2.8
Additions for tax positions of prior years	0.6
Reductions for tax positions of prior years as a result of a lapse in the statute of limitations	(0.7)	(4.1)
Reductions for tax positions of prior years relating to settlements with taxing authorities		(4.5)
Balance - end of year	$ 13.2	$ 11.4