Plan Asset and Target Asset Allocations (Detail)	12 Months Ended
	Dec. 29, 2012		Dec. 31, 2011
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date	100.00%		100.00%
Equity Securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2013, Minimum	40.00%
Target Allocation 2013, Maximum	60.00%
Percentage of Plan Assets at the Measurement Date	55.50%		47.70%
Fixed Income Securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2013, Minimum	10.00%
Target Allocation 2013, Maximum	40.00%
Percentage of Plan Assets at the Measurement Date	12.80%		15.80%
Real Estate Funds
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2013, Minimum	0.00%
Target Allocation 2013, Maximum	25.00%
Percentage of Plan Assets at the Measurement Date	3.20%		3.10%
Other Diversifying Strategies
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2013, Minimum	0.00%	[1]
Target Allocation 2013, Maximum	40.00%	[1]
Percentage of Plan Assets at the Measurement Date	23.60%	[1]	26.80%	[1]
Short Term Investments And Cash
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2013, Minimum	0.00%
Target Allocation 2013, Maximum	25.00%
Percentage of Plan Assets at the Measurement Date	4.90%		6.60%

[1] Includes absolute return funds, hedged equity funds, and guaranteed insurance contracts.