Note 7 - Retirement Plans (Detail) - Components of the net periodic benefit cost for the Plans: (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 25, 2011	Dec. 26, 2010
Amortization of net loss (gain)	$ 7,600
Curtailment gain	(2,800)
Pension Plans, Defined Benefit [Member]
Service cost			38
Interest cost	21,162	22,426	22,910
Expected return on plan assets	(23,703)	(23,996)	(23,820)
Amortization of net loss (gain)	5,647	3,794	2,671
Net periodic benefit cost	3,106	2,224	1,799
Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]
Service cost	101	226	202
Interest cost	1,547	1,910	2,319
Amortization of prior-service (credit) cost	1,259	1,721	1,721
Amortization of net loss (gain)	(1,186)	(1,026)	(691)
Curtailment gain	(2,785)
Net periodic benefit cost	$ (1,064)	$ 2,831	$ 3,551