Note 7 - Retirement Plans (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 25, 2011
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments (in Dollars)	$ 2,800,000
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) (in Dollars)	35,000,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Decrease In The Discount Rate (in Basis Points)	1.05%
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease) (in Dollars)	35,000,000
Defined Benefit Plan, Benefit Obligation (in Dollars)	513,000,000	455,000,000
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	7.70%	8.00%
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation (in Dollars)	250,000
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components (in Dollars)	15,000
Defined Benefit Plan, Amortization of Net Gains (Losses) (in Dollars)	7,600,000
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) (in Dollars)	91,000
2013 Calculations [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.75%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.00%
U.S. Large Cap Equity [Member] | Minimum [Member]
Defined Benefit Plan, Target Plan Asset Allocations	30.00%
U.S. Large Cap Equity [Member] | Maximum [Member]
Defined Benefit Plan, Target Plan Asset Allocations	50.00%
U.S. Small/Mid Cap Equity [Member] | Minimum [Member]
Defined Benefit Plan, Target Plan Asset Allocations	5.00%
U.S. Small/Mid Cap Equity [Member] | Maximum [Member]
Defined Benefit Plan, Target Plan Asset Allocations	17.00%
International/Global Equity [Member] | Minimum [Member]
Defined Benefit Plan, Target Plan Asset Allocations	10.00%
International/Global Equity [Member] | Maximum [Member]
Defined Benefit Plan, Target Plan Asset Allocations	30.00%
Fixed Income [Member] | Minimum [Member]
Defined Benefit Plan, Target Plan Asset Allocations	25.00%
Fixed Income [Member] | Maximum [Member]
Defined Benefit Plan, Target Plan Asset Allocations	45.00%
Cash [Member] | Minimum [Member]
Defined Benefit Plan, Target Plan Asset Allocations	0.00%
Cash [Member] | Maximum [Member]
Defined Benefit Plan, Target Plan Asset Allocations	5.00%
The Plan - 401(k) [Member]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year (in Dollars)	1,200,000
Defined Contribution Plan, Percentage of Contributions Matched Up To The Maximum Percentage of Employee's Salary	100.00%
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	2.00%
Defined Contribution Plan, Cost Recognized (in Dollars)	2,100,000	2,600,000
Rate in 2027 and Thereafter [Member]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	4.50%
Decrease Due to Curtailment Remeasurement [Member]
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) (in Dollars)	(7,200,000)
Decrease Due to Medical Coverage Amendment [Member]
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) (in Dollars)	(3,500,000)
Supplemental Executive Retirement and ERISA Excess Plans [Member]
Defined Benefit Plan, Benefit Obligation (in Dollars)	54,000,000	49,000,000
New Estimate [Member]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year (in Dollars)	$ 4,500,000