Quarterly report pursuant to Section 13 or 15(d)

Components of Pension Cost (Detail)

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Components of Pension Cost (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost - benefits earned during the year $ 5,755 $ 5,322 $ 17,360 $ 15,776
Interest cost on projected benefit obligations 19,236 19,730 57,734 59,173
Expected return on plan assets (20,148) (22,432) (60,462) (67,290)
Amortization of deferred amounts, Net deferred actuarial losses 17,617 10,783 52,856 32,326
Amortization of deferred amounts, Deferred prior service cost 837 863 2,514 2,590
Net periodic pension cost $ 23,297 $ 14,266 $ 70,002 $ 42,575