Benefits Expected To Be Paid From Plans Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012 Net Periodic Pension Cost	Dec. 31, 2011 Net Periodic Pension Cost	Jan. 01, 2011 Net Periodic Pension Cost	Dec. 29, 2012 Net Periodic Postretirement Benefit Cost	Dec. 31, 2011 Net Periodic Postretirement Benefit Cost	Dec. 29, 2012 Net Periodic Postretirement Benefit Cost MMA Subsidy Income	Dec. 29, 2012 Net Periodic Postretirement Benefit Cost Employer Gross Contribution	Dec. 31, 2010 Net Periodic Postretirement Benefit Cost Fiscal Year 2010 MMA Subsidy Income	Dec. 31, 2010 Net Periodic Postretirement Benefit Cost Fiscal Year 2010 Employer Gross Contribution	Dec. 31, 2011 Net Periodic Postretirement Benefit Cost Fiscal Year 2011 MMA Subsidy Income	Dec. 31, 2011 Net Periodic Postretirement Benefit Cost Fiscal Year 2011 Employer Gross Contribution
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
2010	$ 24,884	$ 20,921	$ 16,294	$ 1,366	$ 1,321		$ 1,010	$ 58	$ 693	$ 66	$ 919
2013	25,359						919
2014	25,713						988
2015	26,064						1,018
2016	26,616						1,031
2017	27,013						1,048
2018 - 2022	142,855						4,684
2012				(52)	(66)	(52)
2013						(52)
2014						(54)
2015						(56)
2016						(59)
2017						(60)
2018 - 2022						$ (264)