Quarterly report pursuant to Section 13 or 15(d)

Pension Plans (Details)

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Pension Plans (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jul. 02, 2011
Jul. 03, 2010
Jul. 02, 2011
Jul. 03, 2010
Pension Plans [Abstract]        
Service cost - benefits earned during the year $ 5,272 $ 4,077 $ 10,454 $ 8,160
Interest cost on projected benefit obligations 19,738 19,116 39,443 38,224
Expected return on plan assets (22,442) (19,183) (44,858) (38,355)
Amortization of net deferred actuarial losses 10,779 11,379 21,543 22,751
Amortization of prior service cost 864 987 1,727 1,974
Net periodic pension cost 14,211 16,376 28,309 32,754
Employer contributions     6,600  
Estimated future employer contributions $ 4,100   $ 4,100