Long-Lived Asset Impairment Charges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Dec. 29, 2012	Jun. 18, 2011	Mar. 26, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Asset Impairment Charges				$ 13.1	$ 0.6	$ 0.9
Impairment of Long-Lived Assets Held-for-use	13.1	0.1	2.0	13.1	0.6	0.9
Long-lived and intangible assets belonging to Westville [Member]
Impairment of Long-Lived Assets Held-for-use				11.3
Long-lived and intangible assets belonging to Junction City Facilities [Member]
Impairment of Long-Lived Assets Held-for-use				$ 1.8