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
Mar. 29, 2014
Mar. 30, 2013
Employee Benefit And Retirement Plans [Line Items]    
Service cost - benefits earned during the period $ 6,085 $ 6,893
Interest cost on projected benefit obligations 20,389 18,051
Expected return on plan assets (22,681) (23,682)
Amortization of deferred amounts, Net deferred actuarial losses 9,384 21,362
Amortization of deferred amounts, Deferred prior service costs 1,362 341
Net periodic pension cost $ 14,539 $ 22,965