Benefit Plans - Schedule of Amounts Included in Accumulated Other Comprehensive Income, Net of Tax Which Have Not Yet been Recognized in Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Benefit Plans [Line Items]
Unamortized prior service cost	$ (0.3)	$ (0.4)	$ (0.5)
Unrecognized net actuarial gain	5.3	8.5	5.8
Unamortized prior service benefit (actuarial loss)	$ 5.0	$ 8.1	$ 5.3